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• SQL SERVER – Using MAXDOP 1 for Single Processor Query – SQL in Sixty Seconds #008 – Video

  - by pinaldave

  Today’s SQL in Sixty Seconds video is inspired from my presentation at TechEd India 2012 on Speed up! – Parallel Processes and Unparalleled Performance. There are always special cases when it is about SQL Server. There are always few queries which gives optimal performance when they are executed on single processor and there are always queries…

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• “Query cost (relative to the batch)” <> Query cost relative to batch

  - by Dave Ballantyne

  OK, so that is quite a contradictory title, but unfortunately it is true that a common misconception is that the query with the highest percentage relative to batch is the worst performing.  Simply put, it is a lie, or more accurately we dont understand what these figures mean. Consider the two below simple queries: SELECT * FROM…

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• optimize query: get al votes from user's item

  - by Toni Michel Caubet

  hi there! i did it my way because i'm very bad getting results from two tables... Basically, first i get all the id items that correspond to the user, and then i calculate the ratings of each item. But, there is two different types of object item, so i do this 2 times: show you: function votos_usuario($id){ $previa = "SELECT…

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• Query not returning rows in a table that don't have corresponding values in another [associative] ta

  - by Obay

  I have Table: ARTICLES ID | CONTENT --------------- 1 | the quick 2 | brown fox 3 | jumps over 4 | the lazy Table: WRITERS ID | NAME ---------- 1 | paul 2 | mike 3 | andy Table: ARTICLES_TO_WRITERS ARTICLE_ID | WRITER_ID ----------------------- 1 | 1 2 | 2 3 | 3 To summarize, article 4 has no…

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• MySQL query problem on group by and max

  - by 1s2a3n4j5e6e7v

  My table structure is (id,cluster,qid,priority). I'm trying to figure out how I can display the maximum value of priority for each cluster. Say cluster 1 has priorities 100, 102, 105. I want to display the record containing 105. Please help.

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• Optimize MYSQL Query with Order by

  - by Victor

  Hello, I have seen mysql queries with order by runs slow. Is there any specific way to optimize queries which use order by ? Queries without order by run very fast but with order by its always runs slow. if any one suggest any thing on this as general solutions. Thank You

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• How to optimize this user ranking query

  - by James Simpson

  I have 2 databases (users, userRankings) for a system that needs to have rankings updated every 10 minutes. I use the following code to update these rankings which works fairly well, but there is still a full table scan involved which slows things down with a few hundred thousand users. mysql_query("TRUNCATE TABLE userRankings");…

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• Access VBA sub with form as parameter doesn't alter the form

  - by Ski

  I have a Microsoft Access 2003 file with various tables of data. Each table also has a duplicate of it, with the name '[original table name]_working'. Depending on the user's choices in the switchboard, the form the user choose to view must switch its recordsource table to the working table. I refactored the relevant code to do…

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• Query Tuning Mastery at PASS Summit 2012: The Video

  - by Adam Machanic

  An especially clever community member was kind enough to reverse-engineer the video stream for me, and came up with a direct link to the PASS TV video stream for my Query Tuning Mastery: The Art and Science of Manhandling Parallelism talk, delivered at the PASS Summit last Thursday. I'm not sure how long this link will work , but…

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• Query Tuning Mastery at PASS Summit 2012: The Video

  - by Adam Machanic

  An especially clever community member was kind enough to reverse-engineer the video stream for me, and came up with a direct link to the PASS TV video stream for my Query Tuning Mastery: The Art and Science of Manhandling Parallelism talk, delivered at the PASS Summit last Thursday. I'm not sure how long this link will work , but…

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• Query Tuning Mastery at PASS Summit 2012: The Demos

  - by Adam Machanic

  For the second year in a row, I was asked to deliver a 500-level "Query Tuning Mastery" talk in room 6E of the Washington State Convention Center, for the PASS Summit. ( Here's some information about last year's talk, on workspace memory. ) And for the second year in a row, I had to deliver said talk at 10:15 in the morning, in a…

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• Converting sql query to EF query - nested query in from

  - by vdh_ant

  Hey guys Just wondering how the following sql query would look in linq for Entity Framework... SELECT KPI.* FROM KeyPerformanceIndicator KPI INNER JOIN ( SELECT SPP.SportProgramPlanId FROM SportProgramPlan PSPP INNER JOIN SportProgramPlan ASPP ON (PSPP.SportProgramPlanId…

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• Figuring a max repetitive sub-tree in an object tree

  - by bonomo

  I am trying to solve a problem of finding a max repetitive sub-tree in an object tree. By the object tree I mean a tree where each leaf and node has a name. Each leaf has a type and a value of that type associated with that leaf. Each node has a set of leaves / nodes in certain order. Given an object tree that - we know - has…

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• Sub-query problem on Oracle 10g

  - by Eric

  The following query works on Oracle 10.2.0.1.0 on windows,but doesn't work on Oracle 10.2.0.2.0 on Linux. What's the problem?How can I make it work? Thanks! CREATE TABLE AUDITHISTORY( CASENUM numeric(20, 0) NOT NULL, AUDIT_DATE date NOT NULL, USER_NAME varchar(255) NULL, AUDIT_USECS numeric(6, 0) NOT NULL ) Query: …

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• SQL SERVER – Denali Feature – Zoom Query Editor

  - by pinaldave

  SQL Server next version ‘Denali’ is coming up with very neat feature which can be used while presentations, group discussion or for people who prefers large fonts. I have increased the font size to 400 percentage and for the same reason they are very large. You can adjust the font size which is convenient to you. One more…

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• Adding an LOV to a query parameter (executeWithParams)

  - by shay.shmeltzer

  I showed in the past how you can use the executeWithParams operation to build your own query page to filter a view object to show specific rows. I also showed how you can make the parameter fields display as drop down lists of values (selectOneChoice). However this week someone asked me if you can have those parameter…

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• How can I join this 2 queries?(A select query with join and An unpivot query)

  - by MANG KANOR

  Here are my two queries SELECT EWND.Position, NKey = CASE WHEN ISNULL(Translation.Name, '') = '' THEN EWND.Name ELSE Translation.Name END, Unit = EW_N_DEF.Units FROM EWND INNER JOIN EW_N_DEF ON EW_N_DEF.Nutr_No = EWND.Nutr_No LEFT JOIN Translation ON Translation.CodeMain = EWND.Nutr_no…

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• T-SQL Tuesday #13: Clarifying Requirements

  - by Alexander Kuznetsov

  When we transform initial ideas into clear requirements for databases, we typically have to make the following choices: Frequent maintenance vs doing it once. As we are clarifying the requirements, we need to determine whether we want to concinue spending considerable time maintaining the system, or if we want to…

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• Howto UML: sub methods / calls / operations / procedures

  - by hsmit

  How would you guys model this in UML (in a sequence diagram)? .. car1.drive(); .. ... in Car class: .. drive(){ this.startEngine(); } startEngine(){ this.getKey(); this.insertKey(); } .. a small begin: objx car1 ---- ---- | | | drive() | |-------->| startEngine() | …

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• Mysql - What's wrong with the query...?

  - by SpikETidE

  Hi everybody.... I am trying to query a database to find the following If a customer searches for a hotel in a city between dates A and B, find and return the hotels in which rooms are free between the two dates. There will be more than one room in each room type(i.e. 5 Rooms in type A, 10 rooms in Type B…

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• Redirect/rewrite dynamic URL to sub-domain and create DNS for subdomain

  - by Abdul Majeed

  I have created an application in PHP, I would like to re-direct the following URL to corresponding sub-domain. Dynamic URL pattern: http://mydomain.com/mypage.php?user_name=testuser I wish to re-direct this to the corresponding sub domain: http://testuser.mydomain.com/ How do I create a rewrite rule…

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• htaccess to redirect from domain with sub-directory url to the same url on sub-domain

  - by Ibrahm Yaser

  i have problem of redirecting from domain with sub-directory like http://mydomain.com/project/01/117q803789s92d01 or http://mydomain.com/project/08/117t803789s92d08 .. etc to always http://ww2.mydomain.com/project/01/117q803789s92d01 the other link will to …

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• Function Folding in #PowerQuery

  - by Darren Gosbell

  Originally posted on: http://geekswithblogs.net/darrengosbell/archive/2014/05/16/function-folding-in-powerquery.aspxLooking at a typical Power Query query you will noticed that it's made up of a number of small steps. As an example take a look at the query I did…

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• SQL SERVER – Force Index Scan on Table – Use No Index to Retrieve the Data – Query Hint

  - by pinaldave

  Recently I received the following two questions from readers and both the questions have very similar answers. Question 1: I have a unique requirement where I do not want to use any index of the table; how can I achieve this? Question 2: Currently my table uses…

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• Error 404 after rewrite query strings with htaccess

  - by Cristian

  I'm trying to redirect the URLs of a client's website like this: www.localsite.com/immobile.php?id_immobile=24 In something like this: www.localsite.com/immobile/24.php I'm using this rule in .htaccess but it returns a 404 error page. RewriteEngine On…

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