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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;
参考答案
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