From: Andrew Sullivan <ajs@crankycanuck.ca>
To: pgsql-sql@postgresql.org
Subject: Re: Update problem.
Date: Mon, 2 Apr 2007 11:17:26 -0400
Message-ID: <20070402151726.GA30052@phlogiston.dyndns.org> (raw)
In-Reply-To: <00c301c77536$938a32e0$1102a8c0@dream>
References: <00c301c77536$938a32e0$1102a8c0@dream>
On Mon, Apr 02, 2007 at 04:52:46PM +0200, Shavonne Marietta Wijesinghe wrote:
> At a surtain point i need to replace a record with another
>
> For example i have inserted 4 records. (1, 2 , 3 , 4) I need to
> replace all the values from the record 4 to the record 2 but
> keeping the n_gen serial key. And then delete the record 4. So that
> the next record i insert will take the n_gen 4
If I understand you correclty, you can do an UPDATE to record 4 to
record 2, then do a setval() on the sequence. The setval() is
tricky, though, because you have the problem that other connections
could be using it. I'd lock the table in question while you did all
this.
A
--
Andrew Sullivan | ajs@crankycanuck.ca
Unfortunately reformatting the Internet is a little more painful
than reformatting your hard drive when it gets out of whack.
--Scott Morris
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To: pgsql-sql@postgresql.org
Cc: ajs@crankycanuck.ca
Subject: Re: Update problem.
In-Reply-To: <20070402151726.GA30052@phlogiston.dyndns.org>
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