Bizarre WHERE col = NULL behavior

Posted by Kenneth on Stack Overflow See other posts from Stack Overflow or by Kenneth
Published on 2010-04-08T20:21:58Z Indexed on 2010/04/08 20:23 UTC
Read the original article Hit count: 228

Filed under:

sql-server

This is a problem one of our developers brought to me. He stumbled across an old stored procedure which used 'WHERE col = NULL' several times. When the stored procedure is executed it returns data.

If the query inside the stored procedure is executed manually it will not return data unless the 'WHERE col = NULL' references are changed to 'WHERE col IS NULL'.

Can anyone explain this behavior?

Related posts about sql-server

SQL SERVER – Beginning SQL Server: One Step at a Time – SQL Server Magazine

as seen on SQL Authority - Search for 'SQL Authority'
I am glad to announce that along with SQLAuthority.com, I will be blogging on the prominent site of SQL Server Magazine. My very first blog post there is already live; read here: Beginning SQL Server: One Step at a Time. My association with SQL Server Magazine has been quite long, I have written nearly… >>> More
How to install SQL Server 2005 Configuration Manager without installing SQL Server Management Studio

as seen on Server Fault - Search for 'Server Fault'
Hi, I need to configure SQL Server aliases on a public-facing production server. To do that, I need to install SQL Server Configuration Manager. I was not able to find a standalone installer for that, so I am having to install SQL Server 2005 Client Components. This approach is not ideal as we don't… >>> More
[MAJ] SQL Server 2005 Express Edition - La version gratuite de SQL Server 2005

as seen on ASP-PHP.net - Search for 'ASP-PHP.net'
Modification technique pour le site de l'article. >>> More
How to create SQL Server Express DB from SQL Server DB

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a SQL Server 2008 DB. I want to extract SOME tables (and associated schema, constraints, indexes, etc) and create a SQL Server Express DB. It isn't a sync of the target, we stomp on it. We ONLY need to do this in the file system (not across the wire). We are not fond of the synchronization… >>> More
sql server 2000 error, error trying to connect to sql server 2005

as seen on Stack Overflow - Search for 'Stack Overflow'
i am connecting to sql server 2000 on a remote computer with a dotnet application, but when i try to open the connection it gives the following error: When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections What… >>> More

Developer IT

Bizarre WHERE col = NULL behavior - Developer IT

Bizarre WHERE col = NULL behavior

sql-server

Related posts about sql-server

SQL SERVER – Beginning SQL Server: One Step at a Time – SQL Server Magazine

How to install SQL Server 2005 Configuration Manager without installing SQL Server Management Studio

[MAJ] SQL Server 2005 Express Edition - La version gratuite de SQL Server 2005

How to create SQL Server Express DB from SQL Server DB

sql server 2000 error, error trying to connect to sql server 2005

Categories cloud