Is there any chance of adding a note about this to the docs? It does not
seem to be documented anywhere! Maybe a note in ALTER TABLE
(sql-altertable.htm) and changing the FAQ slightly to mention what happen to
triggers, views, constraints etc.
Regards
Ben
> -----Original Message-----
> From: Fred Yankowski [mailto:fred@ontosys.com]
> Sent: 12 February 2001 21:41
> Cc: pgsql-general@postgresql.org
> Subject: [GENERAL] Re: ALTER DROP COLUMN
>
>
> I just tried this recommended procedure with a little test. It copied
> over the Attribute and Type information and the primary key index, but
> left everything else behind: not-null constraints, defaults,
> references constraints, check constraints, sequence generated for
> 'serial' type -- to name a few.
>
> So how is this useful for anything beyond a toy database?
>
> This inability to drop a column makes it hard to follow an "extreme
> programming" style of development, where one designs only as much into
> the database schema as is needed at the moment (DTSTTCPW, YAGNI).
> When I do that I often find that I need to drop columns (in favor of
> other columns of different types) as I evolve the schema to support
> ever more complex applications. PostgreSQL makes this a bit harder
> than it needs to be.
>
> On Mon, Feb 12, 2001 at 12:34:20PM -0800, Brent R. Matzelle wrote:
> > I know it's a pain, but it isn't all that bad. Just rename your
> > table like so:
> >
> > ALTER TABLE <old_name> RENAME TO <another_name>
> >
>
> > Then re-create the old table without the deleted column(s):
> >
> > SELECT col1, col2, col4 INTO TABLE <old_name> FROM
> > <another_name>
> >
> > Then delete the old table:
> >
> > DROP TABLE <another_name>
>
> --
> Fred Yankowski fred@OntoSys.com tel: +1.630.879.1312
> Principal Consultant www.OntoSys.com fax: +1.630.879.1370
> OntoSys, Inc 38W242 Deerpath Rd, Batavia, IL 60510, USA
>