Re: Retrieve the primary key of a table

Hi

2009/8/3 Alejandro <apinoo@gmail.com>:
> Hi. I need to retrieve the primary key of a table and their value.
>
> I tried with this
> http://wiki.postgresql.org/wiki/Retrieve_primary_key_columns:
>
> SELECT
>   pg_attribute.attname,
>   format_type(pg_attribute.atttypid, pg_attribute.atttypmod)
>
> FROM pg_index, pg_class, pg_attribute
> WHERE
>   pg_class.oid = 'TABLENAME'::regclass AND
>
>   indrelid = pg_class.oid AND
>   pg_attribute.attrelid = pg_class.oid AND
>
>   pg_attribute.attnum = any(pg_index.indkey);
>
> But this shows indexes too.
> http://wiki.postgresql.org/wiki/Talk:Retrieve_primary_key_columns
>
> How can I get only the primary key?
>
> I have postgres 8.1.11.

If you run "psql -E" it will show you all the queries it runs when you
type "\d tablename" and other similar commands.  I think you should be
able to work out from that what the query should be.

--
Michael Wood <esiotrot@gmail.com>