1. Description of unique constraints on the official website
Http://download.oracle.com/docs/cd/E11882_01/server.112/e16508/datainte.htm#CNCPT1642
Uniquekey constraint requires that every value in a column or set of columns beunique. no rows of a
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Preface
Unique is a member of schema Constraints Verification. Its role is to make the value of a field unique (cannot be
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