From: Tom Lane <tgl@sss.pgh.pa.us>
To: Thomas O'Connell <tfo@monsterlabs.com>
Cc: pgsql-hackers@postgresql.org
Cc: pgsql-sql@postgresql.org
Subject: Re: [HACKERS] [GENERAL] Bug with sequence
Date: Thu, 21 Nov 2002 14:30:14 -0500
Message-ID: <13787.1037907014@sss.pgh.pa.us> (raw)
In-Reply-To: <tfo-99ACEC.12534521112002@news.hub.org>
References: <7017.1037851915@sss.pgh.pa.us>
<tfo-99ACEC.12534521112002@news.hub.org>
"Thomas O'Connell" <tfo@monsterlabs.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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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, tfo@monsterlabs.com, pgsql-hackers@postgresql.org
Subject: Re: [HACKERS] [GENERAL] Bug with sequence
In-Reply-To: <13787.1037907014@sss.pgh.pa.us>
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