Re: A Table's Primary Key Listing

On Thu, 18 Aug 2005 07:36:22 -0700 (PDT)
Roger Tannous <roger77_lb(at)yahoo(dot)com> wrote:
> Is there any means to get a list of the Primary Keys (or simply the
> Primary Key if there's only one :) ) for a given table using an SQL query

Here is what I do in PyGreSQL:

SELECT pg_namespace.nspname, pg_class.relname,pg_attribute.attname
FROM pg_class
JOIN pg_namespace ON pg_namespace.oid=pg_class.relnamespace AND
pg_namespace.nspname NOT LIKE 'pg_%'
JOIN pg_attribute ON pg_attribute.attrelid=pg_class.oid AND
pg_attribute.attisdropped='f'
JOIN pg_index ON pg_index.indrelid=pg_class.oid AND
pg_index.indisprimary='t' AND
pg_index.indkey[0]=pg_attribute.attnum

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