From: Richard Huxton <dev@archonet.com>
To: John Coryat <john@coryat.com>
To: pgsql-sql@postgresql.org
Subject: Re: Complex Update
Date: Mon, 5 Jan 2004 11:10:30 +0000
Message-ID: <200401051110.30065.dev@archonet.com> (raw)
In-Reply-To: <3FF6896E.3010602@coryat.com>
References: <3FF6896E.3010602@coryat.com>
On Saturday 03 January 2004 09:20, John Coryat wrote:
> Problem: I have a table that has a field I want to plug with a value
> from other tables.
[snip]
> I would expect it to look something like this:
>
> update orderheader set total = (select sum(amount) from orderdetail
> where orderdetail.orderno=orderheader.orderno) ;
Looks fine to me. In general, you can do something of the form:
UPDATE ta SET a2 = (SELECT expr(b2) FROM tb WHERE b1=a1);
NOTE - make sure you understand what happens when there is no b1=a1 and what
that will mean to your particular setup.
--
Richard Huxton
Archonet Ltd
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: dev@archonet.com, john@coryat.com
Subject: Re: Complex Update
In-Reply-To: <200401051110.30065.dev@archonet.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox