Josh Berkus <josh(at)agliodbs(dot)com> writes:
>> Oh, why didn't you say so? Seems like the correct tool to solve that is
>> a partial unique index, not a constraint at all.
> Hmmm .... we support that? Darn, how do I miss these things. When did we
> start supporting it? Bric still has a lot of users who use 7.2.
Looks like it was added (back) in 7.2.
regards, tom lane