Re: comparing null values

It shouldn't, because comparison to NULL returns "NULL", not TRUE or FALLS

If you want, you need:

select * from tester2 where whatever not like '%STU%' or whatever IS NULL;

Igor Neyman, OCP DBA
ineyman_at_perceptron.com

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Thursday, January 30, 2003 12:41 PM

> Can anyone explain why it is that I seem unable to use 'like' and 'not
like'
> on columns containing null values. (I am unable to find information
> regarding this on MetaLink.)
>
> For example:
>
> SQL> select * from tester2;
>
> COL1 COL2 WHATEVER
> ---- ---- --------
> 1 1 STUFF
> 2 2 STUFF
> 3 3
> 4 4
>
> SQL> select * from tester2 where whatever not like '%STU%';
> no rows selected
>
>
> My question is why does this not return the 3 & 4 columns?
>
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Igor Neyman
  INET: ineyman_at_perceptron.com

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