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  • SQL SERVER – How to Set Variable and Use Variable in SQLCMD Mode

    - by Pinal Dave
    Here is the question which I received the other day on SQLAuthority Facebook page. Social media is a wonderful thing and I love the active conversation between blog readers and myself – actually I think social media adds lots of human factor to any conversation. Here is the question - “I am using sqlcmd in SSMS – I am not sure how to declare variable and pass it, for example I have a database and it has table, how can I make the table variable dynamic and pass different value everytime?” Fantastic question, and here is its very simple answer. First of all, enable sqlcmd mode in SQL Server Management Studio as described in following image. Now in query editor type following SQL. :SETVAR DatabaseName “AdventureWorks2012″ :SETVAR SchemaName “Person” :SETVAR TableName “EmailAddress“ USE $(DatabaseName); SELECT * FROM $(SchemaName).$(TableName); Note that I have set the value of the database, schema and table as a sqlcmd variable and I am executing the query using the same parameters. Well, that was it, sqlcmd is a very simple language to master and it also aids in doing various tasks easily. If you have any other sqlcmd tips, please leave a comment and I will publish it with due credit. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Server Management Studio, SQL Tips and Tricks, T SQL, Technology Tagged: sqlcmd

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  • SQL SERVER- Differences Between Left Join and Left Outer Join

    - by pinaldave
    There are a few questions that I had decided not to discuss on this blog because I think they are very simple and many of us know it. Many times, I even receive not-so positive notes from several readers when I am writing something simple. However, assuming that we know all and beginners should know everything is not the right attitude. Since day 1, I have been keeping a small journal regarding questions that I receive in this blog. There are around 200+ questions I receive every day through emails, comments and occasional phone calls. Yesterday, I received a comment with the following question: What are the differences between Left Join and Left Outer Join? Click here to read original comment. This question has triggered the threshold of receiving the same question repeatedly. Here is the answer: There is absolutely no difference between LEFT JOIN and LEFT OUTER JOIN. The same is true for RIGHT JOIN and RIGHT OUTER JOIN. When you use LEFT JOIN keyword in SQL Server, it means LEFT OUTER JOIN only. I have already written in-depth visual diagram discussing the JOINs. I encourage all of you to read the article for further understanding of the JOINs: Read Introduction to JOINs – Basic of JOINs Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, PostADay, SQL, SQL Authority, SQL Joins, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • Platform Builder: Removing the Version Information from the Desktop

    - by Bruce Eitman
    The question of how to remove the version information from the desktop has been around for a long time. It came up again today. The question is about the string displayed on the desktop that looks like one of these, depending on the OS verison: Windows Embedded CE v6.00 (Build xxxx on xxxx) Microsoft Windows CE v5.00 (Build xxxx on xxxx) Microsoft Windows CE .NET v4.20 (Build xxxx on xxxx) I have looked into this in the past, but never really had a definitive answer. I have an answer now. The short answer is that the version information is displayed if the code is built without SHIP_BUILD defined.  I have to be honest, I have given this answer in the newsgroups in the past, but I still had questions. My questions have come from different build machines giving different results.   I have noticed that some engineer’s workstations would have the version information displayed, while others did not. I always stopped short of spending time investigating further because our release build machines never resulted in the version information being displayed. But, we do not typically define SHIP_BUILD for our releases because our customers want or need the debug output. So today I dug further into the question. The answer is actually quite simple. Microsoft builds the retail shell libraries with SHIP_BUILD defined and releases the libraries with Platform Builder. Normally the source code does not need to be built during Sysgen, so the libraries that Microsoft delivered are linked to create the Explorer shell. So typically the Explorer shell displays the version information for debug builds, but does not for retail builds. The trouble comes when the source code is forced to be rebuilt for a retail build. This might happen if an engineer uses “Build and Sysgen” or builds the Public\Shell folder from the command line with the clean flag. I am not sure if Build and Sysgen will cause the problem or not – I have never used Build and Sysgen and I strongly advise against using it (see Platform Builder: Don’t use Build and Sysgen) Copyright © 2010 – Bruce Eitman All Rights Reserved

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  • SQL SERVER – Demo Script – Keeping CPU Busy

    - by pinaldave
    Recently face very interesting situation, during presentations at event, I was asked very famous questions: “My CPU is very high all the time, how can I reduce it?” This is very interesting question and there are many answers and a single blog post is not good enough to justify this subject. I presented few situation to the person who asked the question. The member of the audience who asked question came to me afterwords and asked me few detailed questions. To answer him, I quickly wrote query which simulate high CPU. Here is the script which I wrote which increased CPU from 10% to 80%. I was wondering if there is any similar script which can simulate high CPU usage. If you have share with me and I will publish with due credit. Here is my script for the same: USE AdventureWorks GO DECLARE @Flag INT SET @Flag = 1 WHILE(@Flag < 1000) BEGIN ALTER INDEX [PK_SalesOrderDetail_SalesOrderID_SalesOrderDetailID] ON [Sales].[SalesOrderDetail] REBUILD SET @Flag = @Flag + 1 END GO   Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, PostADay, SQL, SQL Authority, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • Designing a social network with CQRS, graph databases and relational databases in mind

    - by Siraj Mansour
    I have done quite an amount of research on the topic so far, but i couldn't come up with a conclusion to make up my mind. I am designing a social network and during my research i stumbled upon graph databases, i found neo4j pretty interesting for user relations and traversing through nodes. I also thought of using a relational database such as MS-SQL or MySQL to store entity data only and depending on neo4j for connections between entities. Of course this means more work in my application to store and pull data in and out of 2 different sources. My first question : Is using this approach (graph + relational) a good approach for designing my social network keeping in mind that users on social networks don't have to in synch with real data by split second ? What are the positives and negatives of this approach ? My Second question : I've been doing some reading on CQRS and as i understood it is mostly useful for collaborative environments, and environments where users see a lot of "stale" data. social networks has shared comments, events, etc .. and many users query or update the same data. Could CQRS be a helpful approach ? Would it give any performance/scalability benefits or non-useful complexity ? Is it fairly applicable with my possible choice of (graph + relational) databases approach mentioned in the question above ? My purpose is to know if the approaches i have mentioned above seem good enough for the business context.

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  • How should I design a correct OO design in case of a Business-logic wide operation

    - by Mithir
    EDIT: Maybe I should ask the question in a different way. in light of ammoQ's comment, I realize that I've done something like suggested which is kind of a fix and it is fine by me. But I still want to learn for the future, so that if I develop new code for operations similar to this, I can design it correctly from the start. So, if I got the following characteristics: The relevant input is composed from data which is connected to several different business objects All the input data is validated and cross-checked Attempts are made in order to insert the data to the DB All this is just a single operation from Business side prospective, meaning all of the cross checking and validations are just side effects. I can't think of any other way but some sort of Operator/Coordinator kind of Object which activates the entire procedure, but then I fall into a Functional-Decomposition kind of code. so is there a better way in doing this? Original Question In our system we have many complex operations which involve many validations and DB activities. One of the main Business functionality could have been designed better. In short, there were no separation of layers, and the code would only work from the scenario in which it was first designed at, and now there were more scenarios (like requests from an API or from other devices) So I had to redesign. I found myself moving all the DB code to objects which acts like Business to DB objects, and I've put all the business logic in an Operator kind of a class, which I've implemented like this: First, I created an object which will hold all the information needed for the operation let's call it InformationObject. Then I created an OperatorObject which will take the InformationObject as a parameter and act on it. The OperatorObject should activate different objects and validate or check for existence or any scenario in which the business logic is compromised and then make the operation according to the information on the InformationObject. So my question is - Is this kind of implementation correct? PS, this Operator only works on a single Business-wise Operation.

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  • Help with a simple incremental backup script

    - by Evan
    I'd like to run the following incomplete script weekly in as a cron job to backup my home directory to an external drive mounted as /mnt/backups #!/bin/bash # TIMEDATE=$(date +%b-%d-%Y-%k:%M) LASTBACKUP=pathToDirWithLastBackup rsync -avr --numeric-ids --link-dest=$LASTBACKUP /home/myfiles /mnt/backups/myfiles$TIMEDATE My first question is how do I correctly set LASTBACKUP to the the the directory in /backs most recently created? Secondly, I'm under the impression that using --link-desk will mean that files in previous backups will not will not copied in later backups if they still exist but will rather symbolically link back to the originally copied files? However, I don't want to retain old files forever. What would be the best way to remove all the backups before a certain date without losing files that may think linked in those backups by currents backups? Basically I'm looking to merge all the files before a certain date to a certain date if that makes more sense than the way I initially framed the question :). Can --link-dest create hard links, and if so, just deleting previous directories wouldn't actually remove linked file? Finally I'd like to add a line to my script that compresses each newly created backup folder (/mnt/backups/myfiles$TIMEDATE). Based on reading this question, I was wondering if I could just use this line gzip --rsyncable /backups/myfiles$TIMEDATE after I run rsync so that sequential rsync --link-dest executions would find already copied and compressed files? I know that's a lot, so many thanks in advance for your help!!

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  • What's The Difference Between Imperative, Procedural and Structured Programming?

    - by daniels
    By researching around (books, Wikipedia, similar questions on SE, etc) I came to understand that Imperative programming is one of the major programming paradigms, where you describe a series of commands (or statements) for the computer to execute (so you pretty much order it to take specific actions, hence the name "imperative"). So far so good. Procedural programming, on the other hand, is a specific type (or subset) of Imperative programming, where you use procedures (i.e., functions) to describe the commands the computer should perform. First question: Is there an Imperative programming language which is not procedural? In other words, can you have Imperative programming without procedures? Update: This first question seems to be answered. A language CAN be imperative without being procedural or structured. An example is pure Assembly language. Then you also have Structured programming, which seems to be another type (or subset) of Imperative programming, which emerged to remove the reliance on the GOTO statement. Second question: What is the difference between procedural and structured programming? Can you have one without the other, and vice-versa? Can we say procedural programming is a subset of structured programming, as in the image?

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  • Best Practices for MVC Architecture

    - by Mystere Man
    There are a number of questions on StackOverflow regard MVC best practices, but most of those seem to revolve around things like using Dependancy Injection, or creating helper functions, or do's and don'ts of what to do in views and controllers. My question is more about how to architect an MVC application. For example, we are encouraged to use DI with the Repository pattern to decouple data access from the controller, however very little is said on HOW to do that specifically for MVC. Where would we place the Repository classes, for instance? They don't seem to be model related specifically, since the model should likewise be relatively decoupled from the actual data access technologies. A second question involves how to structure the layers or tiers. Most example applications (Nerd dinner, Music Store, etc..) all seem to use a single tier, 2 layer approach (not counting tests) that typically has controllers directly calling L2S or EF code. If I want to create a multi-tier/layer aplication what are some of the best practices there in regards to MVC? This question is one-part standard q-a, but another part best-practices, so it could go either here or programmers.se, I am marking it CW. If you feel it would be better suited to programmers.se then it can be migrated. EDIT: What happened to the Community Wiki option? It seems to be gone.

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  • VoteCounts: bookmarklet to display up/down votes even for rep<1k

    - by SztupY
    Screenshot / Code Snippet About This small bookmarklet will allow anyone to use the "vulnerability" of the API that it allows you to check the up/down vote count - a feat you could normally achieve by being a 1k+rep user. Mainly useful for sites where you don't have this amount of rep, but want to check the stats of the more controversial questions (usually on meta) No API key is actually used here, but it's trivial to add one. License I don't think a code like this deserves anything other than WTFPL Download It's the following line (javascript - 375 bytes): javascript:(function(){a='jsonp';c=' .vote-count-post';d='up_vote_count';e='down_vote_count';$.ajax({url:document.location.href.replace(/(http:\/\/)(.*)(\/questions\/.*)\/.*/,'$1api.$2/1.0$3'),dataType:a,jsonp:a,success:function(x){b=x.questions[0];$('#question'+c).html(b[d]+"-"+b[e]);$.each(b.answers,function(z,y){$('#answer-'+y.answer_id+c).html(y[d]+"-"+y[e])})}})})() EDIT: This is longer, but it will make the result look like exactly on SO. Took a while to make it exactly 508 chars, so it works with IE too. javascript:(function(){w=function(t,q){l='_vote_count';h='up'+l;j='down'+l;k='</div>';s='<div style="color:';$(t).html(s+'green">'+(q[h]?'+':'')+q[h]+k+'<div class="vote-count-separator">'+k+s+'maroon">'+(q[j]==0?'':'-')+q[j]+k)};a='jsonp';c=' .vote-count-post';$.ajax({url:document.location.href.replace(/(http:\/\/)(.*)(\/questions\/.*)\/.*/,'$1api.$2/1.0$3'),dataType:a,jsonp:a,success:function(x){b=x.questions[0];w('#question'+c,b);$.each(b.answers,function(z,y){w('#answer-'+y.answer_id+c,y)})}})})() Platform For any jquery/bookmarklets compatible browser. Tested with Chrome, FF3.6 and IE8 for SU,SO,MSO Contact sztupy.hu Code It was written in notepad already in minified form. Used firebug to debug. Code is above. Contribute(=decrease code size or make the output nicer) any way you want. I'd be great if you'd do the second code shorter than 508 bytes. Known bugs If a question has more than 30 answers then some of the answers won't be resolved. This can be solved easily for <=100 answers, but for questions with more than 100 answers this is more difficult EDIT: updated to API version 1.0. Answers doesn't work yet.

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  • Learning frameworks without learning languages

    - by Tom Morris
    I've been reading up on GUI frameworks including WPF, GTK and Cocoa (UIKit). I don't really do anything related to Windows (I'm a Mac and Linux guy) or .NET, but I'd like to be able to throw together GUIs for various operating systems. We are in the enviable position now of having high level scripting languages that work with all of the major GUI toolkits. If you are doing Linux GUI programming, you could use GTK in C, but why not just use PyGTK (or PyQt). Similarly, for Java, one can use JRuby. For Mac, there's MacRuby. And on .NET, there's IronRuby. This is all fine and good, and if you are building a serious project, there are tradeoffs that you might encounter when deciding whether to, say, build a WPF app in C# or in IronRuby, or whether you are going to use PyGTK or not. The subjective question I have is: what about learning those frameworks? Are there strong reasons why one should or should not learn something like WPF or Cocoa in a language one is familiar with rather than having to learn a new language as well? I'm not saying you should never learn the language. If you are building Windows applications and you don't know C#, that might be a bit of a problem. But do you think it is okay to learn the framework first? This is both a general question and a specific question. I've used some Cocoa classes from Ruby and Python using things like PyObjC and there always seems to be an impedance mismatch because of the way Objective C libraries get built. Experiences and strong opinions welcome!

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  • Who practices, or is likely to practice, the IEEE Software Engineering? [closed]

    - by user72757
    There is an interesting issue in Software Engineering which I'd like to explore. The issue is firstly what is and what is not software engineering. Secondly, if software engineering is what the IEEE defines it to be, what are good examples of companies which practice the SE? Detailed question: Software engineering (SE) is the application of a systematic, disciplined, quantifiable approach to the design, development, operation, and maintenance of software, and the study of these approaches; that is, the application of engineering to software. [updated definition, originating in 610.12-1990 - IEEE Standard Glossary of Software Engineering Terminology] If we consider as SE only those approaches that 100% match the above definition, we naturally get to SWEBOK (Software Engineering Body of Knowledge) which is created by the IEEE and the ACM. I'm seeking the answer to this: How can I find a company outside the defence industry which practices the SE as defined by IEEE? Clues: SE originates in 1968 NATO conference. The Software Engineering Institute (SEI) is based in the US at Carnegie Mellon University. Funding of the SEI is largely done by the US DoD. Defence industry uses the SE and sometimes has a partnership with the IEEE (as in case of Boeing). Possible decomposition of my big question into smaller chunks: a) Where is anyone who acknowledges the IEEE Software Engineering standards at work and perhaps even uses some of them? http://cs.hbg.psu.edu/cmpsc487/IEEEStds_List.htm b) Where can I find a person or a company building around SWEBOK? http://www.computer.org/portal/web/swebok/html/contents c) What is an example of a company professionally using CSDP (apart from those at IEEE website)? Does anyone have any possible contribution to this question?

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  • Multiple computers on Ubuntu One

    - by L R Bellmore Jr
    I have added files from 4 computers to Ubuntu One. One computer failed. What happens to the files that I uploaded. Are they still on Ubuntu One? How come when I upload a file from computer A, computer B with the same Ubuntu One account does not sync and load that file into computer B - That has created this question.. what happens to files from computers from which I uploaded documents when those computers are no longer active or failed, or no longer have Ubuntu One on that computer from which the files were uploaded... Have I lost the files? The followup question is how come files from Computer A uploaded to Ubuntu One don't sync to Computer B. That is a related question. I need to shut down a computer, reformat the hard drive and install Linux on the entire harddrive instead of a dual boot with Windows XP as I am going to use Virtual Machines instead.. what happens to the files from the Windows Dual Boot that were uploaded to Ubuntu One? Are they removed from Ubuntu One and then have I lost those files if I don't backup to another service first.

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  • How should I start with Lisp?

    - by Gary Rowe
    I've been programming for years now, working my way through various iterations of Blub (BASIC, Assembler, C, C++, Visual Basic, Java, Ruby in no particular order of "Blub-ness") and I'd like to learn Lisp. However, I have a lot of intertia what with limited time (family, full time job etc) and a comfortable happiness with my current Blub (Java). So my question is this, given that I'm someone who would really like to learn Lisp, what would be the initial steps to get a good result that demonstrates the superiority of Lisp in web development? Maybe I'm missing the point, but that's how I would initially see the application of my Lisp knowledge. I'm thinking "use dialect A, use IDE B, follow instructions on page C, question your sanity after monads using counsellor D". I'd just like to know what people here consider to be an optimal set of values for A, B, C and perhaps D. Also some discussion on the relative merit of learning such a powerful language as opposed to, say, becoming a Rails expert. Just to add some more detail, I'll be developing on MacOS (or a Linux VM) - no Windows based approaches will be necessary, thanks. Notes for those just browsing by I'm going to keep this question open for a while so that I can offer feedback on the suggestions after I've been able to explore them. If you happen to be browsing by and feel you have something to add, please do. I would really welcome your feedback. Interesting links Assuming you're coming at Lisp from a Java background, this set of links will get you started quickly. Using Intellij's La Clojure plugin to integrate Lisp (videocast) Lisp for the Web Online version of Practical Common Lisp (c/o Frank Shearar) Land of Lisp a (+ (+ very quirky) game based) way in but makes it all so straightforward

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  • form checkboxes different names each into multiple rows database [closed]

    - by Darlene
    Hi i've been at this for hours and need help. Thanks in advice. i have the following tables: tblprequestion quesid| ques tblanswers answerid|quesid | ans |date This is my form: prequestion form <?php $con = mysql_connect("localhost","root","") or die ("Could not connect to DB Server"); $db_selected = mysql_select_db("nbtsdb", $con) or die("Could not locate the DB"); $query3= mysql_query("SELECT * FROM tblprequestions", $con) or die("Cannot Access prequestions description from Server"); echo"<legend> Pre question :</legend>"; echo"<p></p>"; while($row = mysql_fetch_array($query3)) { echo"<p>"; echo"<input type='checkbox' name='question".$row['quesid']."[]' value='yes' />"; echo"<label>".$row['ques']."</label>&nbsp;&nbsp;&nbsp;"; echo"</p>"; } echo"<p></p>"; ?> i would like to know how to get the values from the form for each question (total of 17) to submit into the database. for example tblprequestion quesid| ques 1 Had a cold or fever in the last week? 2 Had minor outpaient surgery? tblanswers answerid|username |quesid | ans |date 1 lisa 1 yes 10/10/12 2 lisa 2 no 10/10/12

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  • SQL SERVER – Weekly Series – Memory Lane – #039

    - by Pinal Dave
    Here is the list of selected articles of SQLAuthority.com across all these years. Instead of just listing all the articles I have selected a few of my most favorite articles and have listed them here with additional notes below it. Let me know which one of the following is your favorite article from memory lane. 2007 FQL – Facebook Query Language Facebook list following advantages of FQL: Condensed XML reduces bandwidth and parsing costs. More complex requests can reduce the number of requests necessary. Provides a single consistent, unified interface for all of your data. It’s fun! UDF – Get the Day of the Week Function The day of the week can be retrieved in SQL Server by using the DatePart function. The value returned by the function is between 1 (Sunday) and 7 (Saturday). To convert this to a string representing the day of the week, use a CASE statement. UDF – Function to Get Previous And Next Work Day – Exclude Saturday and Sunday While reading ColdFusion blog of Ben Nadel Getting the Previous Day In ColdFusion, Excluding Saturday And Sunday, I realize that I use similar function on my SQL Server Database. This function excludes the Weekends (Saturday and Sunday), and it gets previous as well as next work day. Complete Series of SQL Server Interview Questions and Answers Data Warehousing Interview Questions and Answers – Introduction Data Warehousing Interview Questions and Answers – Part 1 Data Warehousing Interview Questions and Answers – Part 2 Data Warehousing Interview Questions and Answers – Part 3 Data Warehousing Interview Questions and Answers Complete List Download 2008 Introduction to Log Viewer In SQL Server all the windows event logs can be seen along with SQL Server logs. Interface for all the logs is same and can be launched from the same place. This log can be exported and filtered as well. DBCC SHRINKFILE Takes Long Time to Run If you are DBA who are involved with Database Maintenance and file group maintenance, you must have experience that many times DBCC SHRINKFILE operations takes a long time but any other operations with Database are relatively quicker. mssqlsystemresource – Resource Database The purpose of resource database is to facilitates upgrading to the new version of SQL Server without any hassle. In previous versions whenever version of SQL Server was upgraded all the previous version system objects needs to be dropped and new version system objects to be created. 2009 Puzzle – Write Script to Generate Primary Key and Foreign Key In SQL Server Management Studio (SSMS), there is no option to script all the keys. If one is required to script keys they will have to manually script each key one at a time. If database has many tables, generating one key at a time can be a very intricate task. I want to throw a question to all of you if any of you have scripts for the same purpose. Maximizing View of SQL Server Management Studio – Full Screen – New Screen I had explained the following two different methods: 1) Open Results in Separate Tab - This is a very interesting method as result pan shows up in a different tab instead of the splitting screen horizontally. 2) Open SSMS in Full Screen - This works always and to its best. Not many people are aware of this method; hence, very few people use it to enhance performance. 2010 Find Queries using Parallelism from Cached Plan T-SQL script gets all the queries and their execution plan where parallelism operations are kicked up. Pay attention there is TOP 10 is used, if you have lots of transactional operations, I suggest that you change TOP 10 to TOP 50 This is the list of the all the articles in the series of computed columns. SQL SERVER – Computed Column – PERSISTED and Storage This article talks about how computed columns are created and why they take more storage space than before. SQL SERVER – Computed Column – PERSISTED and Performance This article talks about how PERSISTED columns give better performance than non-persisted columns. SQL SERVER – Computed Column – PERSISTED and Performance – Part 2 This article talks about how non-persisted columns give better performance than PERSISTED columns. SQL SERVER – Computed Column and Performance – Part 3 This article talks about how Index improves the performance of Computed Columns. SQL SERVER – Computed Column – PERSISTED and Storage – Part 2 This article talks about how creating index on computed column does not grow the row length of table. SQL SERVER – Computed Columns – Index and Performance This article summarized all the articles related to computed columns. 2011 SQL SERVER – Interview Questions and Answers – Frequently Asked Questions – Data Warehousing Concepts – Day 21 of 31 What is Data Warehousing? What is Business Intelligence (BI)? What is a Dimension Table? What is Dimensional Modeling? What is a Fact Table? What are the Fundamental Stages of Data Warehousing? What are the Different Methods of Loading Dimension tables? Describes the Foreign Key Columns in Fact Table and Dimension Table? What is Data Mining? What is the Difference between a View and a Materialized View? SQL SERVER – Interview Questions and Answers – Frequently Asked Questions – Data Warehousing Concepts – Day 22 of 31 What is OLTP? What is OLAP? What is the Difference between OLTP and OLAP? What is ODS? What is ER Diagram? SQL SERVER – Interview Questions and Answers – Frequently Asked Questions – Data Warehousing Concepts – Day 23 of 31 What is ETL? What is VLDB? Is OLTP Database is Design Optimal for Data Warehouse? If denormalizing improves Data Warehouse Processes, then why is the Fact Table is in the Normal Form? What are Lookup Tables? What are Aggregate Tables? What is Real-Time Data-Warehousing? What are Conformed Dimensions? What is a Conformed Fact? How do you Load the Time Dimension? What is a Level of Granularity of a Fact Table? What are Non-Additive Facts? What is a Factless Facts Table? What are Slowly Changing Dimensions (SCD)? SQL SERVER – Interview Questions and Answers – Frequently Asked Questions – Data Warehousing Concepts – Day 24 of 31 What is Hybrid Slowly Changing Dimension? What is BUS Schema? What is a Star Schema? What Snow Flake Schema? Differences between the Star and Snowflake Schema? What is Difference between ER Modeling and Dimensional Modeling? What is Degenerate Dimension Table? Why is Data Modeling Important? What is a Surrogate Key? What is Junk Dimension? What is a Data Mart? What is the Difference between OLAP and Data Warehouse? What is a Cube and Linked Cube with Reference to Data Warehouse? What is Snapshot with Reference to Data Warehouse? What is Active Data Warehousing? What is the Difference between Data Warehousing and Business Intelligence? What is MDS? Explain the Paradigm of Bill Inmon and Ralph Kimball. SQL SERVER – Azure Interview Questions and Answers – Guest Post by Paras Doshi – Day 25 of 31 Paras Doshi has submitted 21 interesting question and answers for SQL Azure. 1.What is SQL Azure? 2.What is cloud computing? 3.How is SQL Azure different than SQL server? 4.How many replicas are maintained for each SQL Azure database? 5.How can we migrate from SQL server to SQL Azure? 6.Which tools are available to manage SQL Azure databases and servers? 7.Tell me something about security and SQL Azure. 8.What is SQL Azure Firewall? 9.What is the difference between web edition and business edition? 10.How do we synchronize On Premise SQL server with SQL Azure? 11.How do we Backup SQL Azure Data? 12.What is the current pricing model of SQL Azure? 13.What is the current limitation of the size of SQL Azure DB? 14.How do you handle datasets larger than 50 GB? 15.What happens when the SQL Azure database reaches Max Size? 16.How many databases can we create in a single server? 17.How many servers can we create in a single subscription? 18.How do you improve the performance of a SQL Azure Database? 19.What is code near application topology? 20.What were the latest updates to SQL Azure service? 21.When does a workload on SQL Azure get throttled? SQL SERVER – Interview Questions and Answers – Guest Post by Malathi Mahadevan – Day 26 of 31 Malachi had asked a simple question which has several answers. Each answer makes you think and ponder about the reality of the IT world. Look at the simple question – ‘What is the toughest challenge you have faced in your present job and how did you handle it’? and its various answers. Each answer has its own story. SQL SERVER – Interview Questions and Answers – Guest Post by Rick Morelan – Day 27 of 31 Rick Morelan of Joes2Pros has written an excellent blog post on the subject how to find top N values. Most people are fully aware of how the TOP keyword works with a SELECT statement. After years preparing so many students to pass the SQL Certification I noticed they were pretty well prepared for job interviews too. Yes, they would do well in the interview but not great. There seemed to be a few questions that would come up repeatedly for almost everyone. Rick addresses similar questions in his lucid writing skills. 2012 Observation of Top with Index and Order of Resultset SQL Server has lots of things to learn and share. It is amazing to see how people evaluate and understand different techniques and styles differently when implementing. The real reason may be absolutely different but we may blame something totally different for the incorrect results. Read the blog post to learn more. How do I Record Video and Webcast How to Convert Hex to Decimal or INT Earlier I asked regarding a question about how to convert Hex to Decimal. I promised that I will post an answer with Due Credit to the author but never got around to post a blog post around it. Read the original post over here SQL SERVER – Question – How to Convert Hex to Decimal. Query to Get Unique Distinct Data Based on Condition – Eliminate Duplicate Data from Resultset The natural reaction will be to suggest DISTINCT or GROUP BY. However, not all the questions can be solved by DISTINCT or GROUP BY. Let us see the following example, where a user wanted only latest records to be displayed. Let us see the example to understand further. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Memory Lane, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • Is Test Driven Development viable in game development?

    - by Will Marcouiller
    As being Scrum certified, I tend to prone for Agile methodologies while developping a system, and even use some canvas from the Scrum framework to manage my day-to-day work. Besides, I am wondering whether TDD is an option in game development, if it is viable? If I believe this GD question, TDD is not much of a use in game development. Why are MVC & TDD not employed more in game architecture? I come from industrial programming where big projects with big budgets need to work flawlessly, as it could result to catastrophic scenarios if the code wasn't throroughly tested inside and out. Plus, following Scrum rules encourages meeting the due dates of your work while every single action in Scrum is time-boxed! So, I agree when in the question linked above they say to stop trying to build a system, and start writing the game. It is quite what Scrum says, try not to build the perfect system, first: make it work by the Sprint end. Then, refactor the code while working in the second Sprint if needed! I understand that if not all departments responsible for the game development use Scrum, Scrum becomes useless. But let's consider for a moment that all the departments do use Scrum... I think that TDD would be good to write bug-free code, though you do not want to write the "perfect" system/game. So my question is the following: Is TDD viable in game development anyhow?

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  • Update to 13.10: blank screen and repeated suspend on resume from suspend

    - by user208026
    On my Asus x201e, after updating from 13.04 to 13.10, intermittently when awaking from suspend, my screen will blink to a black screen a few times, offers a lock screen, and then go back to suspend unexpectedly (during this it is possible to quickly login to the desktop before the system suspends again). This will repeat each time I subsequently awake it from suspend. Only a restart will escape the suspend loop. The problem only occurs when suspending by closing lid, not by manual (pm-suspend) or menu suspend. Opening the lid after a manual or menu-initiated suspend works as expected. When an external monitor is attached, the black screen and second lock screen still appear twice upon wake, but the system does not fall back into suspend (though networking is disabled and needs to be restarted). This issue arose in tandem with the already raised issue regarding networking not restarting on wake from suspend, though appears to be distinct from that issue and persists after a fix is applied for the networking issue. This issue only occurs on waking from suspend, never upon booting. And only on the second suspend cycle after reboot. This question duplicates the second, unanswered question included in this closed question and seems to correspond with this reported bug. Any ideas for a workaround?

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  • SQL SERVER – Difference between DATABASEPROPERTY and DATABASEPROPERTYEX

    - by pinaldave
    Earlier I asked a simple question on Facebook regarding difference between DATABASEPROPERTY and DATABASEPROPERTYEX in SQL Server. You can view the original conversation there over here. The conversion immediately became very interesting and lots of healthy discussion happened on facebook page. The best part of having conversation on facebook page is the comfort it provides and leaner commenting interface. Question Question from SQLAuthority.com: What is the difference between DATABASEPROPERTY and DATABASEPROPERTYEX in SQL Server? Answer Answer from Rakesh Kumar: DATABASEPROPERTY is supported for backward compatibility but does not provide information about the properties added in this release. Also, many properties supported by DATABASEPROPERTY have been replaced by new properties in DATABASEPROPERTYEX.- source (MSDN). Answer from Alphonso Jones: The only real difference I can see is one, the number of properties contained and the other is that EX returns a sql_variant while DATABASEPROPERTY returns only int. Answer from Ambati Venkatasiva: Both are system meta data functions. DATABASEPROPERTYEX Returns the current setting of the specified database option. DATABASEPROPERTYEX returns the sq-varient value and DATABASEPROPERTY returns integer value. Answer from Rama Sankar Molleti:  Here is the best example about databasepropertyex SELECT DATABASEPROPERTYEX('dbname', 'Collation') Result SQL_1xCompat_CP850_CI_AS Whereas with databaseproperty it retuns nothing as the return type for this is integer. Sql_variant datatype stores values of various sql server supported datatypes except text, ntext, image and timestamp. Answer from Alok Seth:  SELECT DATABASEPROPERTYEX('AdventureWorks', 'Status') DatabaseStatus_DATABASEPROPERTYEX GO --Result - ONLINE SELECT DATABASEPROPERTY('AdventureWorks', 'Status') DatabaseStatus_DATABASEPROPERTY GO --Result - NULL Summary Use DATABASEPROPERTYEX as it is the only function supported in future version as well it returns status of various database properties which does not exists with DATABASEPROPERTY. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • How should I start with Lisp?

    - by Gary Rowe
    I've been programming for years now, working my way through various iterations of Blub (BASIC, Assembler, C, C++, Visual Basic, Java, Ruby in no particular order of "Blub-ness") and I'd like to learn Lisp. However, I have a lot of intertia what with limited time (family, full time job etc) and a comfortable happiness with my current Blub (Java). So my question is this, given that I'm someone who would really like to learn Lisp, what would be the initial steps to get a good result that demonstrates the superiority of Lisp in web development? Maybe I'm missing the point, but that's how I would initially see the application of my Lisp knowledge. I'm thinking "use dialect A, use IDE B, follow instructions on page C, question your sanity after monads using counsellor D". I'd just like to know what people here consider to be an optimal set of values for A, B, C and perhaps D. Also some discussion on the relative merit of learning such a powerful language as opposed to, say, becoming a Rails expert. Just to add some more detail, I'll be developing on MacOS (or a Linux VM) - no Windows based approaches will be necessary, thanks. Notes for those just browsing by I'm going to keep this question open for a while so that I can offer feedback on the suggestions after I've been able to explore them. If you happen to be browsing by and feel you have something to add, please do. I would really welcome your feedback. Interesting links Assuming you're coming at Lisp from a Java background, this set of links will get you started quickly. Using Intellij's La Clojure plugin to integrate Lisp (videocast) Lisp for the Web Online version of Practical Common Lisp (c/o Frank Shearar) Land of Lisp a (+ (+ very quirky) game based) way in but makes it all so straightforward

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  • Ubuntu on Android for Samsung Galaxy note 2?

    - by schulzey
    This question is lengthy, I have to warn you. I'm generally a mac user. My setup currently consists of using mac osx and vmware (windows 7) to run one program that isn't compatible with osx or linux. This program can be run using crossover (wine) as well but it works better with vmware. I'm thinking of switching over to ubuntu as my main operating system on my computers and running vmware or crossover that way to access the program I need. No specific reason why, I guess I'm just sick of the apple/windows machine. I've always wanted to try linux so figure there is no better time than now. The point is I haven't used ubuntu yet so I don't know a lot about it. I was planning on buying the iphone 5 when I saw there is an app to setup ubuntu operating system on an android phone. I'm now thinking that this would be fantastic for me if I bought the samsung galaxy note 2 and was able to install ubuntu and either vmware or crossover to use my windows specific program for work right on my phone. The samsung galaxy note 2 has a 1.4 ghz processor and 2gb of ram which is enough to handle a modern operating system. My program does not need a lot of speed or memory to work. To be honest, the windows specific program I need would work fine on an old laptop running windows xp. My first question is if ubuntu for android is really the full operating system that lets you run programs just like a desktop pc? Is it super slow where it takes many minutes to load up ubuntu? I don't need blazing speeds, but I'd like something useable. My next question has to do with vmware or crossover. Is ubuntu for android capable of running these programs? I think it would be great to use the same operating system like ubuntu on my desktop, laptop, tablets, and phone. Thanks so much for all the help!!!

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  • Adding SSE support in Java EE 8

    - by delabassee
    SSE (Server-Sent Event) is a standard mechanism used to push, over HTTP, server notifications to clients.  SSE is often compared to WebSocket as they are both supported in HTML 5 and they both provide the server a way to push information to their clients but they are different too! See here for some of the pros and cons of using one or the other. For REST application, SSE can be quite complementary as it offers an effective solution for a one-way publish-subscribe model, i.e. a REST client can 'subscribe' and get SSE based notifications from a REST endpoint. As a matter of fact, Jersey (JAX-RS Reference Implementation) already support SSE since quite some time (see the Jersey documentation for more details). There might also be some cases where one might want to use SSE directly from the Servlet API. Sending SSE notifications using the Servlet API is relatively straight forward. To give you an idea, check here for 2 SSE examples based on the Servlet 3.1 API.  We are thinking about adding SSE support in Java EE 8 but the question is where as there are several options, in the platform, where SSE could potentially be supported: the Servlet API the WebSocket API JAX-RS or even having a dedicated SSE API, and thus a dedicated JSR too! Santiago Pericas-Geertsen (JAX-RS Co-Spec Lead) conducted an initial investigation around that question. You can find the arguments for the different options and Santiago's findings here. So at this stage JAX-RS seems to be a good choice to support SSE in Java EE. This will obviously be discussed in the respective JCP Expert Groups but what is your opinion on this question?

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  • SDL & Windows 8 Metro WinRT

    - by Adrian
    I am just beginning to dip my tow into game programming and have been reading up on SDL, SFML, OpenGL, XNA, MonoGame and of course DirectX. (Needless to say there are a lot of choices out there) As much as I like SFMLs syntax I have chosen to read up and start with SDL as it is pretty ubiquitous and available on every platform (Windows, Linux, Mac) and also available on portable devices (Android, iOS) with the current exception of WinPhone 7 After that pre-amble here is my question. I notice that the docs say that for the windows platform the SDL API calls through to DirectX for higher perf. ( http://www.libsdl.org/intro.en/whatplatforms.html ) Microsoft have said that for Metro Game Apps you can only use DirectX (which means no XNA, no OpenGL, no SFML, etc, etc) My question is: If SDL just wraps DirectX calls will I (we) be able to use SDL to bring games to the new Metro WinRT environment and Windows 8 marketplace? This would be great if possible. Additionally as WinPhone 8 is supposedly built on Win8 then this could mean SDL would be available on the win phone in the future too. Thanks for your time in responding to this question and I look forward to hearing your response. EDIT: Based on DeadMG's answer I have installed Visual Studio 11 (beta) in Windows 8 Consumer Preview (CP) and went file-New to check project types. The project types: "Blank Application", "Direct2D Application" and "Direct3D Application" look of interest. I have selected "Direct2D App" but SDL generates its own window when you call: SDL_INIT Is it possible to link/setup the SDL window to point to the Direct2D surface in the this project?

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  • Efficient solution for multiplayer space partioning?

    - by DevilWithin
    This question is a little tricky, but I will try to make it clear, Lets say I am building an online game, not in a mmo scale, but gladly supporting as many players as possible, in a authoritative server approach, and I want really big worlds with lots of AI simulated enemies. I am aware of a few strategies to save server's CPU by subdividing the space and not processing what doesn't need processing. I 've already split the world by regions, that will require loading times and small transitions, which i think is important to mantain the quality of gameplay when playing locally (alone or even with a couple of friends) because the players won't normally be in more than one or two regions. But even a region can become pretty big, and have a lot of NPC simulating at a time, how do I handle this without screwing the player's experience? Approaches like one server per region and alike are not in the table. I am mainly looking for data structures to hold hordes of enemies, and even peaceful NPC. To finalize the question, please note that vehicles exist, therefore its considerably fast to travel within a region, influencing the "when" to cull areas. Sorry for the confusing question, thanks

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  • The lifecycle of "cool"

    - by Dori
    I've been thinking lately about how some programming projects/products become "cool," and in particular, how that trend can later reverse. Here are two examples that might better explain my context: Textmate Whenever someone asks about text editors on OS X, the answer on the SE sites is an automatic "Textmate!" But looked at objectively: Textmate 1.0 shipped October 2004 Textmate 1.5 shipped January 2006 Textmate 2 was announced February 2006 As of September 2010, the currently shipping version is 1.5.9 In all of 2010, there have been a total of three posts on the Textmate blog At what point (if ever) do Textmate fans start thinking about switching to another text editor? When it breaks after some future Apple update? When alpha geeks they respect start recommending something else? Or? jQuery Whenever a JavaScript-related question is asked on the SE sites, the knee-jerk response is "jQuery!" I've seen it happen even when the question itself only required a single line of JavaScript. Or when the question could be better answered by using CSS. Do the answerers understand they're suggesting a blowtorch to light a candle? That they're recommending adding 70K or so of code to do something trivial? Or is it a symptom of "When you have a hammer, everything looks like a nail"—that is, jQuery is all they know how to do, so that's their recommendation? And do they understand that while they may know jQuery well, that doesn't necessarily mean that they know JavaScript? Is there a way to explain that learning JavaScript would make them better jQuery programmers? My bigger-picture questions: Is this niche focus primarily a trait of programmers? How do you get programmers to not immediately jump to recommending their personal favorites? What can motivate programmers to review their initial selection criteria and possibly modify their choice? Your thoughts?

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