From: | Herouth Maoz <herouth(at)oumail(dot)openu(dot)ac(dot)il> |
---|---|
To: | Thomas Good <tomg(at)admin(dot)nrnet(dot)org>, Leslie Mikesell <les(at)Mcs(dot)Net> |
Cc: | pgsql-sql(at)postgreSQL(dot)org |
Subject: | Re: [SQL] Using the IN predicate in an UPDATE... |
Date: | 1998-10-18 09:24:53 |
Message-ID: | l03110700b24f63bf94e4@[194.90.105.28] |
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Thread: | |
Lists: | pgsql-sql |
At 14:37 +0200 on 15/10/98, Thomas Good wrote:
> > Am I missing something here or is this the same as:
> > UPDATE table1 SET id = 2 WHERE id = 1;
> > ??
> > Les Mikesell
> > les(at)mcs(dot)com
>
> 3) Les, What are ya, some kinda smarta**? Yeah, somebody was missing
> something, but it weren't you... ;-)
Hmmm. Are you sure? The original query you presented had different
semantics. It meant "If the recnum has any occurence with id=1, change all
its occurences (even those with id=17) to id=2".
That was the reason why I suggested an "exists" query instead. The above is
only equivalent when each recnum has only one id.
Herouth
--
Herouth Maoz, Internet developer.
Open University of Israel - Telem project
http://telem.openu.ac.il/~herutma
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