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Message Posted: Wed, 16 Nov 2011 @ 08:14:08 GMT


     
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Subj:   NOT ( columnname is NULL) condition in a LOJ
 
From:   Anomy Anom

<-- Anonymously Posted: Wednesday, November 16, 2011 02:57 -->

In an explain involving a LOJ , it reads something like this ...

NOT ( col1 ?is NULL) and then it mentions about doing the LOJ. I can understand the NOT NULL approach but its doing this even AFTER that column is already defined as NOT NULL in the DDL. Why have this NOT NULL check on a column that is guaranteed to be a NOT NULL 'by birth'

Any thoughts ..?



     
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