From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Robert Treat <xzilla(at)users(dot)sourceforge(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: ALTER TABLE TODO items |
Date: | 2004-05-05 17:51:23 |
Message-ID: | 200405051751.i45HpNu11161@candle.pha.pa.us |
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Lists: | pgsql-committers pgsql-hackers |
Tom Lane wrote:
> select * from another;
> f1 | f2
> ----+-------
> 1 | one
> 2 | two
> 3 | three
> (3 rows)
>
> alter table another
> alter f1 type text using f2 || ' more',
> alter f2 type bigint using f1 * 10;
>
> select * from another;
> f1 | f2
> ------------+----
> one more | 10
> two more | 20
> three more | 30
> (3 rows)
Wow, you can reference different column as part of the alter column.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
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