Re: multi column foreign key for implicitly unique columns - Mailing list pgsql-sql

> However, Bruce, this should be on the TODO list:
> 
>      * Allow foreign key to reference a superset of the columns
>        covered by a unique constraint on the referenced table.

It would probably be more beneficial to be able to create a unique
constraint without requiring the fields be indexed.

Gets rid of most of the overhead from double uniques.