Which syntax turns an existing constraint on?（）<br>A:ALTER TABLE table_name ENABLE constraint_name;<br>B:ALTER TABLE table_name STATUS = ENABLE CONSTRAINT constraint _ name;<br>C:ALTER TABLE table_name ENABLE CONSTRAINT constraint _ name;<br>D: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 TURN ON CONSTRAINT constraint _ name;

出自：Oracle认证

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