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Message Posted: Fri, 19 Apr 2002 @ 08:34:40 GMT


     
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Subj:   Re: NULLs and Comparisons
 
From:   Anomy Anom

<-- Anonymously Posted: Thursday, April 18, 2002 23:10 -->

Hi:

The update is not occurring because your WHERE clause is returning a false.

The result, step by step:

Step 1
WHERE X = :IN_x    <---  TRUE
>       AND (Y <> :IN_y OR  <---- FALSE
>            Z <> :IN_Z)    <--- Unknown

Step 2
WHERE TRUE AND Unknown <---  FALSE

with an AND condition, both sides of the AND must be TRUE and here, they are not. So, the update does not take place.



     
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