Here may be other problem. Show us the result of EXPLAIN Analyze. 2011/8/8, Pavel Stehule <pavel.stehule@xxxxxxxxx>: > Hello > > use a functional index > > http://www.postgresql.org/docs/8.4/interactive/indexes-expressional.html > > Regards > > Pavel Stehule > > 2011/8/8 - - <loh.law@xxxxxxxxxxx>: >> 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@xxxxxxxxxxxxxx) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-general > -- ------------ pasman -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
