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Thread: Removing constraints

Removing constraints

From
"Nathan Barnett"
Date:
There is a constraint on my database that was created as part of a foreign
key.  When I dropped the foreign key index, the constraint still remained
behind.  How can I delete this constraint?  It is unnamed and I figure I
need to remove some stuff from the system tables, but I don't know which
ones or what to delete.  I'm using PostgreSQL v7.0.2.  I looked through the
user guides, but couldn't find this info there.

---------------------------------------------
Nathan Barnett

Re: Removing constraints

From
Stephan Szabo
Date:
You should be able remove the fk constraint by dropping the three
associated triggers in pg_trigger.  You can find the correct ones
by look at the tgargs column if you didn't name the constraint.

Stephan Szabo
sszabo@bigpanda.com

On Mon, 13 Nov 2000, Nathan Barnett wrote:

> There is a constraint on my database that was created as part of a foreign
> key.  When I dropped the foreign key index, the constraint still remained
> behind.  How can I delete this constraint?  It is unnamed and I figure I
> need to remove some stuff from the system tables, but I don't know which
> ones or what to delete.  I'm using PostgreSQL v7.0.2.  I looked through the
> user guides, but couldn't find this info there.

RE: Removing constraints

From
"Nathan Barnett"
Date:
Stephan,

Thanks for the initial help.  I followed your instructions, but now I'm
getting an error: "ERROR:  RelationBuildTriggers: 2 record(s) not found for
rel nametable".  Where else would these triggers be referenced.

---------------------------------------------
Nathan Barnett

-----Original Message-----
From: pgsql-general-owner@postgresql.org
[mailto:pgsql-general-owner@postgresql.org]On Behalf Of Stephan Szabo
Sent: Monday, November 13, 2000 11:47 AM
To: Nathan Barnett
Cc: pgsql-general@postgresql.org
Subject: Re: [GENERAL] Removing constraints



You should be able remove the fk constraint by dropping the three
associated triggers in pg_trigger.  You can find the correct ones
by look at the tgargs column if you didn't name the constraint.

Stephan Szabo
sszabo@bigpanda.com

On Mon, 13 Nov 2000, Nathan Barnett wrote:

> There is a constraint on my database that was created as part of a foreign
> key.  When I dropped the foreign key index, the constraint still remained
> behind.  How can I delete this constraint?  It is unnamed and I figure I
> need to remove some stuff from the system tables, but I don't know which
> ones or what to delete.  I'm using PostgreSQL v7.0.2.  I looked through
the
> user guides, but couldn't find this info there.

Re: Removing constraints

From
Tom Lane
Date:
"Nathan Barnett" <nbarnett@cellularphones.com> writes:
> Thanks for the initial help.  I followed your instructions, but now I'm
> getting an error: "ERROR:  RelationBuildTriggers: 2 record(s) not found for
> rel nametable".  Where else would these triggers be referenced.

If you manually add/delete triggers for a relation, you have to also
manually update the trigger count field in its entry in pg_class.

            regards, tom lane