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unique if not null constraint

Roger25Mar 11 2009 — edited Mar 11 2009
Hi,

i have to add a constraint to a field, that field being unique but when is not null. i should mention that i have already another pk defined for this table.

... add constraint un_elevi_CNP unique(CNP) --but just if it's not null

how to do this?

Regards,
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Locked on Apr 8 2009
Added on Mar 11 2009
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