Re: [SQL] Removing a constraint? - Mailing list pgsql-admin

From Stephan Szabo
Subject Re: [SQL] Removing a constraint?
Date
Msg-id Pine.BSF.4.21.0101011838090.35081-100000@megazone23.bigpanda.com
Whole thread Raw
In response to Removing a constraint?  (Michael Davis <mdavis@sevainc.com>)
List pgsql-admin
It should work if you remove all three triggers for the constraint
using drop trigger, don't delete rows from pg_trigger unless you go
through and manually change the row in pg_class for the relation
the trigger is for.

On Mon, 1 Jan 2001, Michael Davis wrote:

> Does anyone know how to completely and accurately remove or drop a
> constraint, specifically a foreign key constraint?  I tried to remove a
> constraint by deleting it's trigger from pg_triggers.  This caused some
> undesirable side effects with other tables involved with the constraint.  I
> have several tables that I need to change the column constraints and
> foreign key constraints on.  Recreating (drop and create) the table every
> time I need to change a column constraint is a pain because all the objects
> that reference the table would also need to be recreated (i.e. views and
> triggers).  How do production DBAs successfully make changes to their
> tables?
>
> FYI, I was able to alter table add the same constraint many times.  Is this
> a problem?  This created a new trigger in pg_triggers every time.


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