Richard Huxton <[EMAIL PROTECTED]> writes:
> * Allow multiple unique constraints to share an index where one is a 
> superset of the others' columns.

> That way you can mark it unique without having the overhead of multiple 
> indexes.

That just moves the uncertain-dependency problem over one spot, ie, it's
the fabricated unique constraint that you can't pin down the
requirements for.

                        regards, tom lane

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