Please start any new threads on our new site at http://forums.sqlteam.com. We've got lots of great SQL Server experts to answer whatever question you can come up with.

Our new SQL Server Forums are live! Come on over! We've restricted the ability to create new threads on these forums.

SQL Server Forums
Profile | Active Topics | Members | Search | Forum FAQ
 
Register Now and get your question answered!
Username:
Password:
Save Password
Forgot your Password?

 All Forums
 SQL Server 2008 Forums
 Transact-SQL (2008)
 Simple WHERE condition
 Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic  

voyager838
Yak Posting Veteran

90 Posts

Posted - 02/19/2011 :  14:38:05  Show Profile  Reply with Quote
Hello

I want filter an table where its not contain any NULL value or empty '' value.

Here is the query:

select [A], [B]
from dbo.[T]
where ([A] != '') OR ([A] IS NOT NULL)

It doesn't work.
What have i missing ??

Someone?

thanks

Edited by - voyager838 on 02/19/2011 14:38:59

jeffw8713
Aged Yak Warrior

USA
819 Posts

Posted - 02/19/2011 :  15:33:42  Show Profile  Reply with Quote
What do you mean it doesn't work? Are you getting an error or invalid results?

If you don't want any row where A is either '' or Null, then you need to use AND:

SELECT A, B
FROM dbo.T
WHERE A <> ''
AND A IS NOT NULL;

Jeff
Go to Top of Page

voyager838
Yak Posting Veteran

90 Posts

Posted - 02/19/2011 :  16:17:28  Show Profile  Reply with Quote
quote:
Originally posted by jeffw8713

What do you mean it doesn't work? Are you getting an error or invalid results?

If you don't want any row where A is either '' or Null, then you need to use AND:

SELECT A, B
FROM dbo.T
WHERE A <> ''
AND A IS NOT NULL;

Jeff



Hi Jeff

I didn't get some error, but it didn't simple get some expected result.

However You solve it. Thanks.

I dont know why and how, but when you use OR instead of AND it simple didn't.

Why ?



/Voyage

Edited by - voyager838 on 02/19/2011 16:18:58
Go to Top of Page

GilaMonster
Flowing Fount of Yak Knowledge

South Africa
4507 Posts

Posted - 02/19/2011 :  18:14:46  Show Profile  Visit GilaMonster's Homepage  Reply with Quote
Simple boolean logic.

An OR returns true if either condition is true. Since it is impossible for a value to both = '' and be NULL, there is no way that both conditions can be false. Hence all rows will qualify for that predicate

--
Gail Shaw
SQL Server MVP
Go to Top of Page

voyager838
Yak Posting Veteran

90 Posts

Posted - 02/19/2011 :  18:55:44  Show Profile  Reply with Quote
Thanks GilaMonster
Go to Top of Page
  Previous Topic Topic Next Topic  
 Reply to Topic
 Printer Friendly
Jump To:
SQL Server Forums © 2000-2009 SQLTeam Publishing, LLC Go To Top Of Page
This page was generated in 0.06 seconds. Powered By: Snitz Forums 2000