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;

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;

出自：Oracle认证

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