From: Guillaume Lelarge <guillaume.lelarge@gmail.com>
To: Guillaume LELARGE <guillaume.lelarge@gmail.com>
To: emilu@encs.concordia.ca
To: pgsql-sql@postgresql.org
Subject: Re: Add column and specify the column position in a table
Date: Thu, 18 May 2006 17:43:19 +0200
Message-ID: <d854adec0605180843y646f953cwb490a03f3c1d0602@mail.gmail.com> (raw)
In-Reply-To: <20060518140014.GA3122@surnet.cl>
References: <446B9418.3080700@encs.concordia.ca>
<446C0BC0.7050805@gmail.com>
<20060518140014.GA3122@surnet.cl>
2006/5/18, Alvaro Herrera <alvherre@commandprompt.com>:
> Guillaume LELARGE wrote:
> > Emi Lu a écrit :
> > > I am trying to insert one column to a specific position in a table.
> > >
> > > In mysql, I can do:
> > > . create table test(id varchar(3), name varchar(12));
> > > . alter table test add column givename varchar(12) after id;
> > >
> > >
> > > I am looking for similar things in postgresql to add a new column to the
> > > correct position in a table.
> >
> > There's no similar thing in PostgreSQL. You have to duplicate the table
> > to do it.
>
> ... which is the same thing MySQL does, only you must do it explicitely.
>
Do you mean that, using "alter table test add column" with the "after"
option, MySQL creates a new table, populates it with the old table
data and finally drops the old table ? I mean, there's the same
performance problem with big tables ?
--
Guillaume.
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: guillaume.lelarge@gmail.com, emilu@encs.concordia.ca
Subject: Re: Add column and specify the column position in a table
In-Reply-To: <d854adec0605180843y646f953cwb490a03f3c1d0602@mail.gmail.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox