![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-56/ti_inject-812ce.png)
设有关系模式:student(sno, sname, age, dept),现利用命令: CREATE VIEW stu AS SELECT *FROM student WHERE dept='cs'WITH CHECK OPTION 创建了一个视图。则以下SQl命令中能正确执行的是
A.
UPDATE stu SET dept='maths'
B.
UPDATE stu SET dept='maths'WHERE age>=20
C.
INSERT INTO stu VALUES ('2004001', 'John', 30, 'cs')
D.
INSERT INTO stu VALUES ('2004001', 'John', 50, 'maths')