[EMAIL PROTECTED] wrote:
Stephen Toney <[EMAIL PROTECTED]> wrote:
select count(*) from keyword a, keyword b where a.key=b.key and
a.value='music' and b.value='history';
4,318 records have value='music' and 27,058 have value='history'. The
keys are 12-byte strings. That doesn't seem like an extreme case to
me.
The result should be 116,836,444.
A faster approach would be:
SELECT (SELECT count(*) FROM keyword WHERE value='music')*
(SELECT count(*) FROM keyword WHERE value='history');
You seem to be overlooking a.key=b.key condition.
Igor Tandetnik
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