This section extends the subquery work in Section 11.8 by considering correlated and existential subqueries. The subqueries discussed earlier were simple, uncorrelated sub-queries. An uncorrelated ...
I wrote a query (with lots of help, see my painfully plentiful other threads) using a correlated subquery and it takes 5.78 seconds PER RECORD to return results. The SAME query, only I select the ...
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