Skip site navigation (1) Skip section navigation (2)

Re: change existing table definition

From: "Martin Fandel" <martin(dot)fandel(at)alphyra-evs(dot)de>
To: chen(at)musc(dot)edu
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: change existing table definition
Date: 2005-06-28 15:59:24
Message-ID: 1119974365.18693.16.camel@fandelm.ecommit.de (view raw or flat)
Thread:
Lists: pgsql-admin
Aehm sorry. ALTER TABLE is not only in PostgreSQL 8 ;). Only the
datatypes can be changed in postgres 8 (right?). I answered to fast.
I'm sorry.

CREATE TABLE newtable ( "bla" varchar(50));
CREATE INDEX/TRIGGER/... (with different names as the production table)
INSERT INTO newtable (select * from production);
ALTER TABLE production RENAME TO old;
ALTER TABLE newtable RENAME TO production;

If this is working correctly, you can drop the old INDEXES and 
rename them.

If its not working correctly 

ALTER TABLE production RENAME TO new;
ALTER TABLE old RENAME TO production;

and insert the different data (which is in the oldtable) into the
production table.

Greetings,
Martin


Am Dienstag, den 28.06.2005, 17:29 +0200 schrieb Martin Fandel:
> Hi
> 
> ALTER TABLE is only in PostgreSQL 8. But you can create a new table 
> with varchar(50) and copy the data from the existing into the new 
> table. How much relation_size has your table? Do you create the
> dbsize-functions which are included in the contrib package?
> 
> Best regards,
> Martin
> 
> Am Dienstag, den 28.06.2005, 10:39 -0400 schrieb Chuming Chen:
> > Peter Eisentraut wrote:
> > 
> > >Chuming Chen wrote:
> > >  
> > >
> > >>How can I change the column definition of an existing table, ie. from
> > >>varchar(30) to varchar(50)? Is there any way to add a new column to
> > >>an existing table?
> > >>    
> > >>
> > >
> > >The ALTER TABLE command can do all that.  You need version 8.0 or later 
> > >for some functionality though.
> > >
> > >  
> > >
> > Is there another way to do it in 7.* ?
> > 
> > ---------------------------(end of broadcast)---------------------------
> > TIP 1: subscribe and unsubscribe commands go to majordomo(at)postgresql(dot)org


In response to

Responses

pgsql-admin by date

Next:From: Chuming ChenDate: 2005-06-28 17:26:56
Subject: Re: change existing table definition
Previous:From: Scott MarloweDate: 2005-06-28 15:41:33
Subject: Re: How to compare the schemas ?

Privacy Policy | About PostgreSQL
Copyright © 1996-2014 The PostgreSQL Global Development Group