RE: Tuning By cardinality Estimates

From: Allen, Brandon <>
Date: Fri, 6 Mar 2009 09:02:35 -0700
Message-ID: <64BAF54438380142A0BF94A23224A31E1122E57454_at_ONEWS06.oneneck.corp>

A common example of correlated join criteria would be:

select . . .
where make='FORD'
and model='MUSTANG';

The CBO doesn't know that all Mustangs are built by Ford, so it's not aware that the extra filter condition won't really filter out any more rows.


-----Original Message-----
From: [] On Behalf Of hrishy

I didnt quite understand the statement
"Check if the join criteria between SC and SH are correlated"

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