Subject Re: [firebird-support] unique constraint vs unique index
Author Martijn Tonies
Hello Nick,

> what, if any, is the effective difference?
> I recall that a unique constraint is enforced via an index so does it
> ever matter which is used?

Yes, Foreign Key Constraints can "point" to a Unique Constraint, but
not to a Unique Index.

Martijn Tonies
Database Workbench - tool for InterBase, Firebird, MySQL, NexusDB, Oracle &
MS SQL Server
Upscene Productions
My thoughts:
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