• 2022-06-01
    下列新增一个DELETE触发器语句正确的是()。
    A: CREATE TRIGGER deleteorder BEFORE DELETE ON orders FOR EACH ROW
    B: CREATE TRIGGER deleteorder BEFORE INSERT ON orders FOR EACH ROW
    C: CREATE TRIGGER deleteorder BEFORE DROP ON orders FOR EACH ROW
    D: CREATE TRIGGER deleteorder BEFORE UPDATE ON orders FOR EACH ROW
  • 举一反三