Date: Sat, 8 Mar 2014 18:37:54 -0800 (PST)
From: David Johnston <polobo@yahoo.com>
To: pgsql-sql@postgresql.org
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Subject: Re: Foreign key to a partial key
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> I thought of creating a foreign key constraint this way:
> 
> The constraint would need to make reference to the wbs_name assigned to
> the
> project, but at the table products, no column contains that info.

Add the wbs_name column to the products table.  Since a code is invalid
without knowing which project it belongs to your table definition is wrong.

Then you can create the proper two-column foreign key that references on
primary key on the codes table.

David J.


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