Date: Wed, 19 Apr 2006 20:21:18 +0300
From: Volkan YAZICI <yazicivo@ttnet.net.tr>
To: Wiebe Cazemier <halfgaar@gmx.net>
Cc: pgsql-sql@postgresql.org
Subject: Re: Primary key reference count
Message-ID: <20060419172117.GA206@alamut>
References: <e258pv$5fc$1@sea.gmane.org>
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On Apr 19 02:01, Wiebe Cazemier wrote:
> I'm trying to find which of the tables in pg_catalog contains the amount of
> references to a primary key, but I can't seem to find it.

Here's simple query, to list which table's which columns references to a
specific table. (Hope this is what you asked for.)

SELECT TBL.table_name, COL.column_name
    FROM information_schema.referential_constraints AS REF
    INNER JOIN information_schema.table_constraints AS TBL
               USING (constraint_name)
    INNER JOIN information_schema.constraint_column_usage AS COL
               USING (constraint_name)
    INNER JOIN information_schema.table_constraints AS PRI
               ON (PRI.constraint_name = REF.unique_constraint_name)
    WHERE PRI.table_name = 'pri_id'; -- Your target table goes here.

This is a quick & dirty hack. Just wanted to show the possibility of the
idea using information schema. (You don't want to deal with internal
tables, ain't?)


Regards.