Re: Problem query - Mailing list pgsql-performance

From Kevin Grittner
Subject Re: Problem query
Date
Msg-id 4DE768E9020000250003E002@gw.wicourts.gov
Whole thread Raw
In response to Problem query  (CS DBA <cs_dba@consistentstate.com>)
Responses Re: Problem query
List pgsql-performance
Shaun Thomas <sthomas@peak6.com> wrote:

> You're counting the number of maximum values in your table for
> tds_cx_ind and cxs_ind_2, but there will always be at least one
> for every combination.

Good point.

> 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;

-Kevin

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