| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Bruno Wolff III <bruno(at)wolff(dot)to> |
| Cc: | Alex Martinoff <froggle2003(at)yahoo(dot)com>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Constructing column from different individual fields in |
| Date: | 2003-09-10 15:44:28 |
| Message-ID: | 200309101544.h8AFiSO01239@candle.pha.pa.us |
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| Lists: | pgsql-general |
Bruno Wolff III wrote:
> On Tue, Sep 09, 2003 at 21:02:21 -0700,
> Alex Martinoff <froggle2003(at)yahoo(dot)com> wrote:
> > I'm wondering if it's possible to have a query construct a column
> > where the value of the column at each row is taken from another field
> > in that same row. For example, suppose you have a table like:
>
> You can use CASE to do this.
You can also use UNION:
SELECT col1 ...
UNION
SELECT col2 ...
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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