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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