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• In SQL, can we always write an inner join statement as a main query and subquery?

  - by Jian Lin

  In SQL, can we always write an inner join statement as a main query and subquery? For example, select * from gifts g where g.giftID in (select giftID from sentGifts); can do a join and show the gifts sent in the sentGifts table, but it won't be able to show the sentTime because that is inside the subquery?

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• SQL: ... WHERE X IN (SELECT Y FROM ...) ...

  - by Craig Johnston

  Is the following the most efficient in SQL to achieve its result: SELECT * FROM Customers WHERE Customer_ID NOT IN (SELECT Cust_ID FROM SUBSCRIBERS) Could some use of joins be better and achieve the same result?

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• How to use Linq To Sql to get Users who has more than 2 photos?

  - by Mike108

  The scenario is I want to get the users who has more than 2 photos. There are two table: [Users] (UserId, UserName) [UserPhotos] (PhotoId, PhotoName, UserId) and UserId is a Foreign Key. A user may have none photo in the [UserPhotos] table. How to use Linq To Sql to get List who has more than 2 photos?

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• Does Hibernate log the values that it assigns to placeholders in prepared SQL statements?

  - by Derek Mahar

  Does Hibernate log the values that it assigns to placeholders in prepared SQL statements? How can configure Log4j so that it writes these values to my log files?

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• SQL SERVER Query result in CSV format is possible?

  - by gopal

  Hi, Is it possible to get the query result in .CSV file format from SQL SERVER 2000 and above versions? If so can we use this feature from an asp.net application to get the result in CSV format? If so how can we do this?

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• LINQ to SQL .Count takes way to much process time and decreases performances.

  - by soldieraman

  LINQ to SQL .Count takes way to much process time and decreases performances. I am doing a recursive loop and for one child (lets call it parent) I have to check the number of children under it to make a decision if it should be included or not. The Count is too slow 8 ms :( for 120 parent records. Any ideas to make it quicker.

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• How do I insert records into 2 SQL tables sharing a dependency when I don't commit until the end?

  - by Cunning Lingus

  I keep finding myself in this situtation: I have an ASP.NEt 2.0 app. I have to insert into 2 tables in SQL. There is a dependency between the tables. I insert a record the first using a transaction. Then I move onto the 2nd table. But, because the first isn't committed yet the second one throws a error.

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• how to get time (hh:mm:ss) from sql query ?

  - by Gold

  hi i have Database with date field. i see the time like: 1900-01-01 13:38:00.000 how i can see it like: 13:38 ? (i work on sql server 2008) thank's in advance

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• PHP: How do I find (Oracle) parameters in a SQL query?

  - by Bartb

  Suppose you have a string: "SELECT * FROM TABLE WHERE column1 = :var1 AND column2 = :var2" Now, how do I get an array with all the variables like so: Array ( [0] => :var1 [1] => :var2 ) I've tried it with PHP's preg_match_all, but I struggle with the regex. $varcount = preg_match_all("/ :.+ /", $sql, $out);

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• What SQL query should I perform to get the result set expected?

  - by texai

  What SQL query should I perform to get the result set expected, giving the first element of the chain (2) as input data, or any of them ? table name: changes +----+---------------+---------------+ | id | new_record_id | old_record_id | +----+---------------+---------------+ | 1| 4| 2| | -- non relevant data -- | | 6| 7| 4| | -- non relevant data -- | | 11| 13| 7| | 12| 14| 13| | -- non relevant data -- | | 31| 20| 14| +----+---------------+---------------+ Result set expected: +--+ | 2| | 4| | 7| |13| |14| |20| +--+ I know I should consider change my data model, but: What if I couldn't? Thank you in advance!

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• How to distinguish between the first and rest for duplicate records using sql ?

  - by Biswanath

  Hi, These are the input table and required output table. Input table ID Name ------------- 1 aaa 1 ababaa 2 bbbbbb 2 bcbcbccbc 2 bcdbcdbbbbb 3 ccccc Output table ID Name Ord ----------------------------- 1 aaa first 1 ababaa rest 2 bbbbbb first 2 bcbcbccbc rest 2 bcdbcdbbbbb rest 3 ccccc first First and Rest is based on the occurrence of an ID field. Is there a way to write a SQL query to achieve this ? P.S. - This question is somewhat similar to what I am looking for.

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• SQL Exception: A truncation error was encountered trying to shrink VARCHAR '...' to length x

  - by Tom Brito

  I know really little about sql, can anyone give me a deeper explanation (or references) of what do this exception means? Possible related question: http://stackoverflow.com/questions/1016901/truncate-a-varchar-to-specific-length-in-derby-automatically

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• How to write or append to text file using sql?

  - by aron

  Hello, in short i need to convert following C# code into SQL stored procedure foreach (var e in Entity) { if (File.Exists(e.Filename)) File.AppendAllText(e.Filename,e.Content); else File.WriteAllText(e.Filename, e.Content); }

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• Any DAL generators that will work on .NET 1.1 with SQL CE 3.1?

  - by Schneider

  Are there any DAL generators or ORMs that will work on .NET 1.1 with SQL CE 3.1? This is only for a short lived project, so cost would be an issue

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• Do I need to translate (local) in a sql server connection string?

  - by DanDan

  When connecting to sql server, I have the hardcoded string "(local)". Is this a string I need to make available for localisation? ie, does (local) always work no matter the current language settings?

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• How can I return a substring of a LINESTRING in SQL Server 2008 Spatial?

  - by sabbour

  Say I have a LINESTRING defined as LINESTRING(-122.360 47.656, -122.343 47.656, -122.310 47.690, -122.310 47.670, -122.300 47.630) And I want to get a substring from POINT(-122.360 47.656) to POINT(-122.310 47.690) How can I return a substring of a LINESTRING in SQL Server 2008 Spatial?

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• How can this SQL be wrong? What am I not seeing?

  - by ropstah

  Can anybody please spot my error, this should be a legal query in SQL shouldn't it?? Unknown column u.usr_auto_key in the ON clause This is the database schema: User: (usr_auto_key, name, etc...) Setting: (set_auto_key, name etc..) User_Setting: (usr_auto_key, set_auto_key, value) And this is the query... SELECT `u`.`usr_auto_key` AS `u__usr_auto_key`, `s`.`set_auto_key` AS `s__set_auto_key`, `u2`.`usr_auto_key` AS `u2__usr_auto_key`, `u2`.`set_auto_key` AS `u2__set_auto_key`, `u2`.`value` AS `u2__value` FROM `User` `u`, `Setting` `s` LEFT JOIN `User_Setting` `u2` ON `u`.`usr_auto_key` = `u2`.`usr_auto_key` WHERE (`s`.`sct_auto_key` = 1 AND `u`.`usr_auto_key` = 1 AND admin_property is null)

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• In SQL Server, how can I separate a large number of tsql statement into batches?

  - by Yousui

  Hi guys, In SQL Server, how can I separate a large number of tsql statement into batches? Should I use the GO statement in stored procedures or functions? Should I use the GO statement in explicit transaction management situation(between BEGIN TRANSACTION and ROLLBACK TRANSACTION or COMMIT TRANSACTION)? Are there some best practice about this topic? Great thanks in advance.

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• In SQL Server 2008 is there a way to generate a report as to how much space on disk each table takes

  - by Matt

  IN SQL Server 2008 is there a way to generate a report as to how much space on disk each table takes? I can do it one by one by checking the storage properties, but I was wondering if there was a way, maybe even a query to generate such a report.

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• How can I create dates/times and compare them in SQL?

  - by William

  I'm trying to create a BBS using PHP and SQL, and I want to make it so the topic with the most current post is on top of the topic list. what is a easy way to check if one date and time is more current than another?

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• How to check results of LINQ to SQL query?

  - by rem

  In a WPF app I'd like to check if a return of a LINQ to SQL query contains some records, but my approach doesn't work: TdbDataContext context = new TdbDataContext(); var sh = from p in context.Items where p.Selected == true select p; if (sh == null) { MessageBox.Show("There are no Selected Items"); } Where am I wrong?

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• Is there a way to have SQL server validate object references in Stored Procs?

  - by Scott Weinstein

  The following code executes fine in SQL Server create proc IamBrokenAndDontKnowIt as select * from tablewhichdoesnotexist Of course if I try to run it, it fails with Invalid object name 'tablewhichdoesnotexist'. Is there any way to compile or verify that Stored Proc are valid?

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• How to check if a Constraint exists in Sql server?

  - by Lieven Cardoen

  I have this sql: ALTER TABLE dbo.ChannelPlayerSkins DROP CONSTRAINT FK_ChannelPlayerSkins_Channels but apparently, on some other databases we use, the constraint has a different name. How do I check if there's a constraint with the name FK_ChannelPlayerSkins_Channels.

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• Ways I can protect my site excluding XSS and Sql injection?

  - by Tom

  Hi,So, members of my website can post topics, replies, comments, edit them and so on. I always use htmlspecialchars and addslashes for html inputs to protect my site against XSS and SQL injection attacks. Is it enough or is there something more I miss? Thanks.

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• How to get total number of hours between two dates in sql server?

  - by Pandiya Chendur

  Consider two dates 2010-03-18 22:30 and 2010-03-19 03:30 .... How to get the number of hours in between the two dates in sql server.....

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