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A condition to define uniqueness of rows in a table. An example of UniqueConstraint is a primary key.
Superclasses
UniqueKey
Attributes
deferrability
Indicates if the validity of the UniqueConstraint is to be tested at each statement or at the end of a transaction.type:multiplicity: |
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| DeferrabilityType ( initiallyDeferred | initiallyImmediate | notDeferrable ) | |||||
| exactly one |