On Dienstag 05 Mai 2009 Tom Lane wrote:
> Apparently this is just an index, not a constraint (the difference
> being that it was made with CREATE INDEX, not ALTER TABLE ADD
> CONSTRAINT). Try
Is there a performance difference? Or is it just a matter of taste which
one you use? Technically, are they both indices, or is the constraint a
check that's executed on insert/update, but doesn't store the values?
mfg zmi
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