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单项选择题Which syntax turns an existing constraint on?()

A、ALTER TABLE table_name   ENABLE constraint_name;

B、ALTER TABLE table_name   STATUS = ENABLE CONSTRAINT constraint_name;

C、ALTER TABLE table_name   ENABLE CONSTRAINT constraint_name;

D、ALTER TABLE table_name   STATUS ENABLE CONSTRAINT constraint_name;

E、ALTER TABLE table_name   TURN ON CONSTRAINT constraint_name;

  • C
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