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I found it in the SQL 2011 spec... If the <select list> “*” is simply contained in a <table subquery> that is immediately contained in an <exists predicate>, then the <select list> is equivalent … < RhodiumToad> the one problem is that in pg you can do exists(select func() from ... where the func() is an SRF that might return 0 rows An SRF is a set returning function. In PostgreSQL, we can do …
answered Mar 24 '17 by Evan Carroll