②建立信息系(IS)选修了1号课程的学生的视图IS_S1

参考答案:

②CREATE VIEW IS_S1(SnoSnameGrade) AS SELECT Student SnoSnameGrade FROM StudentSC WHERE Sdept='IS'AND Student.Sno=SC Sno AND SC.Cno='1'；②CREATE VIEW IS_S1(Sno，Sname，Grade) AS SELECT Student Sno，Sname，Grade FROM Student，SC WHERE Sdep