Re: a change of query
От | Chad Thompson |
---|---|
Тема | Re: a change of query |
Дата | |
Msg-id | 06eb01c2dd1e$ee5488b0$32021aac@chad обсуждение исходный текст |
Ответ на | a change of query ("James Cooper" <jim@luckydigital.com>) |
Список | pgsql-sql |
how about
select count(distinct cp.person_id) from cluster_person cp, cluster c where cp.cluster_id = c.cluster_id and c.c_id = 1
Is that as fast?
Chad
----- Original Message -----From: James CooperTo: sqlSent: Tuesday, February 25, 2003 3:03 PMSubject: [SQL] a change of queryselect
distinct cp.person_id from cluster_person cp, cluster c where cp.cluster_id = c.cluster_id and c.c_id = 1can this query be changed to give just the row count?( of the distinct rows )
yes: i am aware of count() but this wont count the distinct rows - I can however achive this with an nested person_id in(select... etc but that slows things down big time!!!!
the above quey gives me my resultset asap - is there a way to get just the number of rows with the same speed
My thoughts are that I could just make a plpgsql function with a GET Diagniostics ROW_COUNT -
thoughts?
James
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