Stephane Bortzmeyer <[EMAIL PROTECTED]> writes:
> Yes, PostgreSQL is right and implement the standard. Now, what's the
> rationale for the standard? I understand it for a single column but,
> for several columns, it should be still possible to have different
> tuples, such as (3, NULL) and (5, NULL) for instance.
If that's what you want, declare it as UNIQUE not PRIMARY KEY.
regards, tom lane
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