在学生表tb_student(Sno, Sname, Sage, Sdept)上分别定义了两个视图v_S1和v_S2: CREATE VIEW v_S1 AS SELECT Sno,Sname,Sage FROM tb_student WHERE Sdept= 'IS'; CREATE VIEW v_S2 AS SELECT Sno,Sname,Sage FROM tb_student WHERE Sdept= 'IS' WITH CHECK OPTION; 若要执行下列两条语句: 1 INSERT INTO v_S1 VALUES('2012109', '' , 20); 2 INSERT INTO v_S2 VALUES('2012209', '' , 19); 以下描述中,正确的是