Tom Lane wrote:
"Richard Broersma" <[EMAIL PROTECTED]> writes:
There is one possible alteration that may or many not improve
performance. This would be to replace the EXISTS with a LEFT JOIN
WHERE IS NOT NULL;
That changes the behavior, doesn't it? Or is event_log_no a unique
key for Myevents? I think what you want is to make the EXISTS an IN
instead.
regards, tom lane
Yes event_log_no is a unique key for myevents.
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