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List:       postgresql-sql
Subject:    Re: [SQL] alter column from varchar(32) to varchar(255) without view
From:       Emi Lu <emilu () encs ! concordia ! ca>
Date:       2009-03-19 14:54:34
Message-ID: 49C25CAA.409 () encs ! concordia ! ca
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>> PostgreSQL 8.0.15.
>> Is there a way that I can easily alter column type from varchar(32) to
>> varchar(255) but do not have to worry about views dependent on it?

> You should test it carefully and it is considered a bad practice -
> I'll probably get sued for recommending this :-), but you may try:
> 
> SELECT * from pg_attribute where attname = 'colname' and  attrelid =
> (SELECT oid FROM pg_class WHERE relname='_tablename');
> 
> UPDATE pg_attribute set atttypmod = 4+_new_length_in_your_case_255
> where attrelid = _attrelid_from_above_ and attname = 'colname';

I am afraid that only admin can do this dictionary change :(

If it does work, would it cause any storage or efficiency problem? Or it 
is just permission issues probably?

Thank you,

--
Lu Ying

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