Re: Query with rightmost function does not use index
| От | pasman pasmański |
|---|---|
| Тема | Re: Query with rightmost function does not use index |
| Дата | |
| Msg-id | CAOWY8=Z-B7k5+MFoD+t743Kaxz-gZhuO4da9QfuSekT+2FWU5Q@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: Query with rightmost function does not use index (Pavel Stehule <pavel.stehule@gmail.com>) |
| Список | pgsql-general |
Here may be other problem. Show us the result of EXPLAIN Analyze. 2011/8/8, Pavel Stehule <pavel.stehule@gmail.com>: > Hello > > use a functional index > > http://www.postgresql.org/docs/8.4/interactive/indexes-expressional.html > > Regards > > Pavel Stehule > > 2011/8/8 - - <loh.law@hotmail.com>: >> For a table where column col has an index, the query: >> SELECT ... FROM ... WHERE col = MD5('') >> doesn't seem to use an index but >> SELECT ... FROM ... WHERE col = 'd41d8cd98f00b204e9800998ecf8427e' >> does. >> >> Is this a gotcha? >> I'm using PostgreSQL 8.4.8 on i686-pc-linux-gnu, compiled by GCC >> gcc-4.5.real (Ubuntu/Linaro 4.5.2-8ubuntu4) 4.5.2, 32-bit >> >> >> > > -- > Sent via pgsql-general mailing list (pgsql-general@postgresql.org) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-general > -- ------------ pasman
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