From: | Bruno Wolff III <bruno(at)wolff(dot)to> |
---|---|
To: | pilsl(at)goldfisch(dot)at |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: SQL-question (JOIN) |
Date: | 2003-02-01 01:07:45 |
Message-ID: | 20030201010745.GB14084@wolff.to |
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Thread: | |
Lists: | pgsql-general |
On Fri, Jan 31, 2003 at 22:20:52 +0100,
pilsl(at)goldfisch(dot)at wrote:
> not sure if such question are on-topic here. (where would this
> question be on-topic ?)
>
> I need to join two tables with a logical "if-statement". If for a
> certain row in table1 there is a related row in table2, then take the
> row from table2 else take it from table1. The relation is a simple
> equal on one column.
I think you want something like this:
select coalesce(table2.name,table1.name) from table1 right join table2
using (uid);
(Warning the above wasn't actually tested for syntax errors. It also assumes
that name is not null in table2.)
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