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I think the subquery will be run once for each row of outer query, no matter what.

Tulains Córdova
– Tulains Córdova

2014-02-21 12:06:12 +00:00
Commented Feb 21, 2014 at 12:06
2

@user61852 not with a query optimizer that has at least a small amount of sense...

AakashM
– AakashM

2014-02-21 12:32:10 +00:00
Commented Feb 21, 2014 at 12:32
Almost any query optimizer will see that the can only return 1 data set for the non-correlated subquery.

Adam Zuckerman
– Adam Zuckerman

2014-02-22 03:00:59 +00:00
Commented Feb 22, 2014 at 3:00

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