Message-ID: <076b01c39d75$3d677270$0403a8c0@fejleszt4>
From: =?ISO-8859-1?Q?SZUCS_G=E1bor?= <surrano@mailbox.hu>
To: <pgsql-sql@postgresql.org>
References: <64184.138.88.163.115.1067274631.squirrel@physics.gmu.edu>
Subject: Re: URGENT!!! changing Column size
Date: Tue, 28 Oct 2003 18:02:14 +0100
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I have a php script that patches database, comparing pg_catalog's tables to
input files. One thing it can do, but I can't take responsibility ;) is
changing the type of a column.

It's basically the same that everyone wrote, except that I also examine
dependencies, as broad an examination as I could think about.

However; the code is not yet ready, and not my exclusive possession, but the
steps I could tell you are:

1. Note oid:
   SELECT oid, relname from pg_class WHERE relname='institution'

2. Identify the attribute:
   SELECT * from pg_attribute WHERE attrelid = xxx AND ...

3. Search for depends:
   SELECT d.*
   FROM pg_depend d, pg_attribute a
   WHERE refobjid=a.attrelid and refobjsubid=a.attnum
     AND ...
   -- you are on your own here ;)

4. Drop those dependencies (more likely, foreign keys, constraints, indexes)

5. Do the change

6. Apply dependencies.

HTH,

G.
------------------------------- cut here -------------------------------
----- Original Message ----- 
From: <mohan@physics.gmu.edu>
Sent: Monday, October 27, 2003 6:10 PM


> Hi can we change the size of a column in postgres. I have a table named
> institution and column name is name varchar2(25), i want to change it to
> varchar2(50). Please let me know.
>
> --Mohan