subquery factoring questions.

Posted by Sujee on Stack Overflow See other posts from Stack Overflow or by Sujee
Published on 2010-06-03T03:38:39Z Indexed on 2010/06/03 3:44 UTC
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sql

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Oracle

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subquery

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correlated-subquery

Hi,

Please explain.

a) is "subquery factoring" used to replace a non-correlated subquery? What about correlated subquery?

b) if it is true, are "subquery" and "subquery factoring" executed exactly once?

c) "subquery" vs "subquery factoring" which one is better

Thank you.

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