From: | Oleg Bartunov <oleg(at)sai(dot)msu(dot)su> |
---|---|
To: | pgsql-hackers(at)postgreSQL(dot)org |
Cc: | pgsql-sql(at)postgreSQL(dot)org |
Subject: | counting distinct result of join |
Date: | 2000-04-04 19:35:35 |
Message-ID: | Pine.GSO.3.96.SK.1000404222531.13408S-100000@ra |
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Lists: | pgsql-hackers pgsql-sql |
Hi,
are there an efficient way to count distinct result from join ?
I know it's possible in 7.0 to do
select count(distinct m.msg_id) from messages m, message_section_map ms
where m.msg_id = ms.msg_id;
but I need it working in production for 6.5.3
I'd like not to use temp tables as I dont' have any experience
with them in production.
Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83
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