下列为加密视图 CREATE VIEW vv6_student AS SELECT sno,sname,saddress FROM student WHERE saddress LIKE '%潍坊%' with check OPTION; 不能通过此视图的是:
A.
DELETE FROM vv6_student WHERE sname='' (假设为山东济南人)
B.
DELETE FROM vv6_student WHERE sname='于' (假设阳为山东潍坊人)
C.
UPDATE vv6_student set saddress='潍坊市昌' WHERE sname='于'
D.
insert into vv6_student VALUES ('008','','山东潍坊市坊子区')