From: | "Continuing Technical Education" <CTE(at)Dal(dot)Ca> |
---|---|
To: | "Michael Richards" <michael(at)fastmail(dot)ca> |
Cc: | "Pgsql-sql" <pgsql-sql(at)postgresql(dot)org> |
Subject: | Re: Conditional query plans. |
Date: | 2000-10-20 12:16:55 |
Message-ID: | 00aa01c03a8f$a2fe8f20$5911be86@cte.Dal.Ca |
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Lists: | pgsql-hackers pgsql-sql |
> update users set enabled='f',disablereason='We do not allow our
> system to be used for SPAM.' where id in (select id from users where
> loginid in (select distinct loginid from logins where
> ip='123.123.12.12'));
Would it run better as:
update users set enabled='f',disablereason='We do not allow our
system to be used for SPAM.' where id in (select distinct loginid from
logins where
ip='123.123.12.12');
Or perhaps even:
update users set enabled='f',disablereason='We do not allow our
system to be used for SPAM.' where id in (select unique id from users,logins
where
users.loginid=logins.loginid where ip='123.123.12.12');
I don't know if that helps the query plan, but it looks prettier :)
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