Myth: PK and Unique Constraint Index Must beUnique[size=100%]•Common misperception that the underliningindex in a PK/Unique constraint must be unique
[size=100%]•A non-unique index can police any PK/Uniqueconstraint
[size=100%]•A non-unique index must police any PK/Unique constraint that is:
[size=100%]–Deferrable
[size=100%]–No validated