From: Scott Marlowe <smarlowe@g2switchworks.com>
To: Bryce Nesbitt <bryce1@obviously.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: How to copy data between joined columns?
Date: Fri, 07 Apr 2006 15:34:49 -0500
Message-ID: <1144442088.32269.31.camel@state.g2switchworks.com> (raw)
In-Reply-To: <4436CC56.3040707@obviously.com>
References: <4436CC56.3040707@obviously.com>
On Fri, 2006-04-07 at 15:32, Bryce Nesbitt wrote:
> I have a need to copy/update data from one column to another, based on a
> join condition. Is this easy to do in pure SQL? I have google'ed
> without luck for a easy solution (that's not Microsoft specific, that
> is). For example:
>
> postgres=#
> select xx_thing.date_start,xx_note.created_date
> from xx_thing
> join xx_issue using (thing_id) join xx_note using (issue_id)
> where xx_note.created_date is not null;
>
> date_start | created_date
> ----------------+---------------------
> 2006-03-17 | 1900-01-01
> (...many... rows)
>
> I need to copy date_start to created_date, for all records that meet a
> particular where condition.
If it's for the same rows in the same table, you're overworking it.
update table set field1=field2 where somecondition;
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To: pgsql-sql@postgresql.org
Cc: smarlowe@g2switchworks.com, bryce1@obviously.com
Subject: Re: How to copy data between joined columns?
In-Reply-To: <1144442088.32269.31.camel@state.g2switchworks.com>
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