From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | "Thomas O'Connell" <tfo(at)monsterlabs(dot)com> |
Cc: | pgsql-hackers(at)postgresql(dot)org, pgsql-sql(at)postgresql(dot)org |
Subject: | Re: [HACKERS] [GENERAL] Bug with sequence |
Date: | 2002-11-21 19:30:14 |
Message-ID: | 13787.1037907014@sss.pgh.pa.us |
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Lists: | pgsql-general pgsql-hackers pgsql-sql |
"Thomas O'Connell" <tfo(at)monsterlabs(dot)com> writes:
> It seems worth pointing out, too, that some SQL purists propose not
> relying on product-specific methods of auto-incrementing.
> I.e., it is possible to do something like:
> insert into foo( col, ... )
> values( coalesce( ( select max( col ) from foo ), 0 ) + 1, ... );
> and this is easily placed in a trigger.
... but that approach is entirely unworkable if you want any concurrency
of insert operations. (Triggers are a tad product-specific, too :-()
regards, tom lane
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