Date: Mon, 25 Dec 2006 21:10:30 -0700
From: Michael Fuhr <mike@fuhr.org>
To: Jan Meyland Andersen <jma@agile.dk>
Cc: pgsql-sql@postgresql.org
Subject: Re: Related tables to a view
Message-ID: <20061226041029.GA61490@winnie.fuhr.org>
References: <1404.62.66.218.59.1167083523.squirrel@mail.agile.dk>
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On Mon, Dec 25, 2006 at 10:52:03PM +0100, Jan Meyland Andersen wrote:
> If I have a view which is a selection from field1 and field2 from table1
> and field1 and field2 from table2.
> 
> How can I make a selection which returns the relation for the fields in a
> way so I am able to se which field belongs to which table.

You could query pg_depend to find out which tables and columns the
view's rewrite rule depends on but that's not as specific as what
you're requesting.  I'm not aware of a way to associate a particular
table column with a particular view column short of parsing the view
definition or rule action; doing so would have to allow for the
possibility of a view column deriving its value from an arbitrarily
complex expression involving multiple tables, subqueries, etc.

-- 
Michael Fuhr