Re: IN vs EXISTS equivalence
| От | Tom Lane |
|---|---|
| Тема | Re: IN vs EXISTS equivalence |
| Дата | |
| Msg-id | 15026.1217893692@sss.pgh.pa.us обсуждение |
| Ответ на | Re: IN vs EXISTS equivalence ("Kevin Grittner" <Kevin.Grittner@wicourts.gov>) |
| Ответы |
Re: IN vs EXISTS equivalence
Re: IN vs EXISTS equivalence |
| Список | pgsql-hackers |
"Kevin Grittner" <Kevin.Grittner@wicourts.gov> writes:
> I'm adding some NOT EXISTS examples to the thread for completeness of
> what someone might want to address while working on it. For two
> queries which can easily be shown (to a human viewer, anyway) to
> return identical results, I see performance differences of over five
> orders of magnitude.
Could we see EXPLAIN ANALYZE not just EXPLAIN for these? When people
are complaining of bad planner behavior, I don't find bare EXPLAIN
output to be very convincing.
regards, tom lane
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