"Kevin Grittner" <Kevin.Grittner@xxxxxxxxxxxx> wrote: > Shaun Thomas <sthomas@xxxxxxxxx> wrote: >> What you really want is this: >> >> SELECT count(1) FROM ( >> SELECT DISTINCT tds_cx_ind, cxs_ind_2 >> FROM max_xtrv_st_t >> ); > > Or maybe: > > SELECT count(DISTINCT (tds_cx_ind, cxs_ind_2)) FROM max_xtrv_st_t; Or maybe not. I tried various forms of the query against "real" tables here, and Shaun's format was ten times as fast as my last suggestion and 12% faster than my first suggestion. They all gave the same result, of course, and they all used a seq scan.. -Kevin -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
