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From: "Josh Berkus" <josh@agliodbs.com>
Subject: Re: Updating a table column with ref integrity
To: teknokrat <teknokrat@yahoo.com>, pgsql-sql@postgresql.org
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Teknokrat,

> I need to to change the type of a table column. The problem is that
> this 
>  table has a ref integrity constarint set up with another table. Does
> 
> anyone know how I can do this easily without breaking any
> constraints.

Easily?  No.

In sum:  dump your database to file.  Backup.  Edit the file.
  Re-create and re-load the database.

-Josh Berkus