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• Does table columns increase select statement execution time

  - by paokg4

  I have 2 tables, same structure, same rows, same data but the first has more columns (fields). For example: I select the same 3 fields from both of them (SELECT a,b,c FROM mytable1 and then SELECT a,b,c FROM mytable2) I've tried to run those queries on 100,000 records (for each table) but at the end I got the same execution time (0.0006 sec) Do you know if the number of the columns (and in the end the size of the one table is bigger than the other) has to do something with the query execution time?

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• Is there any sql interpreter for objects?

  - by Behrooz

  Is there any interpreter that takes a string or even a custom object as input and execute it on my datasource? I cannot use linq to object because query always changes and the report i'm working on, has about 6000 queries which i can reduce to 9 if i find some tool doing that for me. Opensource is very applicable. thanks in advance.

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• Is CodeIgniter's ActiveRecord resource intensive?

  - by iamdadude

  I’m coding an application with server resources in mind, so I don’t want to use too much so that this application scales in the future. I don’t mind writing my own queries. So, is ActiveRecord resource intensive for my application? Or does it not make a difference? Thanks!

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• Data access layer using Linq to SQL

  - by Andrei Tanasescu

  I am building a c# - linq - sql server winforms/asp.net application, accessing a database. I would like my business logic layer to be easily testable, and that means not littering it with Linq database queries everywhere. What design patterns/ best practices are available for the following use cases - inserting/updating a new object - searching for an object - loading a bunch of related data into a sort of "presentation" object that could be displayed by various views ?

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• memcached vs. internal caching in PHP?

  - by waitinforatrain

  Hey, I'm working on some old(ish) software in PHP that maintains a $cache array to reduce the number of SQL queries. I was thinking of just putting memcached in its place and I'm wondering whether or not to get rid of the internal caching. Would there still be a worthwihle performance increase if I keep the internal caching, or would memcached suffice?

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• Can't stop Hibernate from writing log to console (log4j.properties is ok)

  - by blackliteon

  I've already set <property name="show_sql">false</property> & disable all messages in log4j.properties But Hibernate shit to console with all queries & statements.

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• Installing a large size apk application on Android phone

  - by user348686

  I have an application which is of size 130MB. when i try to install its displaying insufficient memory error. but i have around 170MB left in available space in internal memory. How can i Install this app? The size of the app is large because it contains many media files. In Motorolla droid its getting installed. but on Nexus One its giving this error.

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• PHP Doctrine: filtering data which is already loaded?

  - by ropstah

  I'm new to Doctrine and ActiveRecord. How should I filter a table after it has been loaded? (i suppose this is preferred over sending multiple queries?) Is this 'good' or 'bad'? class UserTable extends Doctrine_Table { function filterByGroup($group) { $ut = new UserTable(); foreach($this as $u) { if($u->group = $group) $ut->add($u); } return $ut; } }

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• finding missing values, mysql??

  - by praveenmon

  i am using mysql database i have a table called sales its primary key is sales_id ------------------------------------- sales_id | invoice_id | ------------------------------------- 1 | 147 2 | 148 3 | 150 for sales-id 3 the invoice is supposed to be 149. i want to know which numbers are missing from invoice_id (i start invoice_id is 147 and end invoice_id is 4497). The invoice_id had no relation with sales_id is it possible to know which numbers are missing from invoice_id, using some queries??

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• Need help to understand :source option of has_one/has_many through of Rails

  - by Tri Vuong

  Hi Please help me in understanding the :source option of has_one/has_many through association. The Rails api explanation makes very little sense to me "Specifies the source association name used by has_many :through queries. Only use it if the name cannot be inferred from the association. has_many :subscribers, :through = :subscriptions will look for either :subscribers or :subscriber on Subscription, unless a :source is given. " Thanks.

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• Ado.net Entities + get table by T

  - by john

  Hi all Is it posible to get a table to do queries on with Ado.net Entities? In linq ou could do DataContext.GetTable.Where...... Thanks in advance

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• i want to copy the output of unix and sqlplus into a file .

  - by randeepsp

  I am using Solaris. I have to log into sql plus and run some queries, which give a huge result set. I want to copy all that into a file. Is there any command for it in unix or sqlplus ?

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• How to disable activerecord cache logging in rails

  - by user1508459

  I'm trying to disable logging of caching in production. Have succeeded in getting SQL to stop logging queries, but no luck with caching log entries. Example line in production log: CACHE (0.0ms) SELECT merchants.* FROM merchants WHERE merchants.id = 1 LIMIT 1 I do not want to disable all logging, since I want logger.debug statements to show up in the production log. Using rails 3.2.1 with Mysql and Apache. Any suggestions?

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• flash video dynamic width and height change in Action Script 3.0

  - by coderex

  hi I have a video player and the video file came from one xml file, The videos are in different dimension so how can i set the video dimension dynamically? _vid = new Video(); _vid.attachNetStream(_vidStream); How can i give the new dimension of the video, the default i get is http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/flash/media/Video.html Video(width:int = 320, height:int = 240) Creates a new Video instance. I need the height and width of the video, How

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• Optimize SELECT DISTINCT CONCAT query in MySQL

  - by L. Cosio

  Hello! I'm running this query: SELECT DISTINCT CONCAT(ALFA_CLAVE, FECHA_NACI) FROM listado GROUP BY ALFA_CLAVE HAVING count(CONCAT(ALFA_CLAVE, FECHA_NACI)) > 1 Is there any way to optimize it? Queries are taking 2-3 hours on a table with 850,000 rows. Adding an index to ALFA_CLAVE and FECHA_NACI would work? Thanks in advanced

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• Loading index in MemoryIndex instance

  - by Javi

  Hello, Is there any way to load an existing index into an instance of MemoryIndex?. I have an application which uses Hibernate Search so I can use index() in FullTextEntityManager instance to index an object. I'd like to recover back the created index and insert it into a MemoryIndex instance to execute several queries over it. Is it possible? Thanks.

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• Java connecting to Http which method to use?

  - by jax

  I have been looking around at different ways to connect to URLs and there seem to be a few. My requirements are to do POST and GET queries on a URL and retrieve the result. I have seen URL class DefaultHttpClient class And there were some others in apache commons which method is best?

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• Overriding 'require' in Clojure?

  - by StackedCrooked

  Would it be possible to override the 'require' command so that it will try to download a certain resource if it was not found on the local machine. For example: (require 'examples.introduction) ; if not found => download from the net ; (url: http://media.pragprog.com/titles/shcloj/code/examples/introduction.clj)

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• where to get this Java.exe file for ORacle installation

  - by vas

  Hi just installed oracle 11g and tried to start the "Oracle SQL developer" so as to start writing queries. Its asking me Enter the full pathname for the java.exe file . Where do i find this. I did a global search for java.exe and am sure did not got some oracle related pdf files. Also my Oracle is installed out of users/vas

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• php check if record exist.

  - by user329394

  hi all, i found this to check if file exist. is there a way how to check if record exist first? php.net i want to check if record exist first, if exist then do update, else do insert. i do understand how to make a queries for select and insert and i dont have problem with it. if(record exist) { update query} else { insert query}

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• android tag editor

  - by GatesReign

  It is my first time building an android app. Was wondering firstly, if there are demos that exists which could help me to build a media tag editor (form to edit mp3 files). I would also like to know how to populate the sd card on the emulator. Any help on android would be good. Thanks all!

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• Need Help Writing SQL query

  - by user204588

  I have two product tables Product1 and Product2. There is a one 2 one mapping on the field ProductId. What I want is to get all the product ids where the Product2.Exported field is false AND Where the product ids that are in Product1 but not in Product2 table. Right now I have two queries that I'm trying to mash into one. SELECT ProductId FROM Product1 WHERE ProductId NOT IN(Select ProductId From Product2) SELECT ProductId FROM Product2 WHERE Exported = 0

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• Does the for foreach construct in java create a hard or soft copy?

  - by Doug

  Say I have the following piece of java code ArrayList<Double> myList = new Double[100]; for (Double x : myList) x = randomDouble(); Does this actually modify myList or just the dummy variable? I realize I should just try this code segment out, but I think this is the sort of thing I should be able to google or search for on this site, and several queries so far have turned up nothing useful.

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• Mysql - NOW() function calling

  - by Ockonal

  Hello, I'm using php for making queries for mysql. Here is one: UPDATE `subscribers` SET `curDate` = NOW() WHERE `e_mail` = "$resEmail" curDate - DateTime type. The problem is that after this query curDate of given email is 0000-00-00 00:00:00 What's wrong?

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• ADO.net Data Services - Querying

  - by Prajuvan

  Just I started learning ADO.NET Data Services. Some Pages show the querying like (sample) http://localhost:1705/ServiceExample/SomeService.svc/Persons(1)/Name http://localhost:1705/ServiceExample/SomeService.svc/Persons(1)/Name/$value Is it XPath or XQuery? Where can i get complete rules for forming such queries with examples? Thanks in advance.

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