第 33 题 (多选题)： Which two statements are true about views.

A. A view must only refer to tables in its defining query. B. The WITH CHECK clause prevents certain rows from being displayed when querying the view. C. Views can be updated without the need to re-grant privileges on the view. D. The WITH CHECK clause prevents certain rows from being updated or inserted in the underlying table through the view. E. Views can be indexed 显示答案