Subject unique contrsaint vs unique index?
Author Sándor Tamás

here, with my collgues we had a conversation about the difference
between unique constraints and unique indices.
As we went through, we realized that we can use unique constraint for
foregin keys, but not unique index. The main question is: is there any
reason for both of them, and if not, then should we always use unique
constraint instead of unique index?


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