Johnymas PHP EXISTS and NOT EXISTS

EXISTS and NOT EXISTS

Dodano dne: 03-07-2008 14:50:55

PRIMER :

EXISTS and NOT EXISTS

If a subquery returns any rows at all, EXISTS subquery is TRUE, and NOT EXISTS subquery is FALSE. For example:

SELECT column1 FROM t1 WHERE EXISTS (SELECT * FROM t2);

Traditionally, an EXISTS subquery starts with SELECT *, but it could begin with SELECT 5 or SELECT column1 or anything at all. MySQL ignores the SELECT list in such a subquery, so it

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EXISTS and NOT EXISTS