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12：update sc set grade=grade+5 where cno='c01' 运行结果：
13：delete sc where cno=(select cno from course where cname ='高等数学')运行结果：
14：create unique index ind_cname on course(cname)运行结果：
1：use school go create view avggrade as select s.sdept,avg(sc.grade)as'avggrade' from student s,sc sc where s.sno=sc.sno and sc.grade is not null group by s.sdept go select * from avggrade go
