| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | cnliou(at)eurosport(dot)com |
| Cc: | pgsql-sql(at)postgresql(dot)org |
| Subject: | Re: EXISTS Keyword |
| Date: | 2001-10-04 01:59:44 |
| Message-ID: | 200110040159.f941xio07679@candle.pha.pa.us |
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| Thread: | |
| Lists: | pgsql-sql |
> Hello!
>
> I vaguely remember that someone said somewhere that
> EXISTS runs faster than IN:
>
> SELECT * FROM table1 where field1 EXISTS (SELECT
> field4 FROM table2)
Move field1 into the subquery and join it to table2. See the FAQ for an
example.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
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