第 22 题 (多选题)： Which two statements are true regarding a SAVEPOINT.

A. Only one SAVEPOINT may be issued in a transaction. B. Rolling back to a SAVEPOINT can undo a CREATE INDEX statement. C. A SAVEPOINT does not issue a COMMIT. D. Rolling back to a SAVEPOINT can undo a DELETE statement. E. Rolling back to a SAVEPOINT can undo a TRUNCATE statement. 显示答案