实验三

insert into student values('95001','李勇','男','20','cs' 
)
go
insert into student values('95002','刘晨','女','19','is')
go
insert into student values('95003','王敏','女','18','ma')
go
insert into student values('95004','张立','男','19','is')
go
select * from student
go
insert into course values('1','数据库',null,'4')
go
insert into course values('2','数学',null,'2')
go
insert into course values('3','信息系统',null,'4')
go
insert into course values('4','操作系统',null,'3')
go
insert into course values('5','数据结构',null,'4')
go
insert into course values('6','数据处理',null, 
'2')
go
insert into course values('7','pascal语言',null,'4')
go
select * from course
go
update course set cpno=5 where cno=1
go
update course se 
t cpno=1 where cno=3
go
update course set cpno=6 where cno=4
go
update course set cpno=7 where cno=5
go
update course set cpno=6 where cno=7
go
insert into sc values('95001','1','92')
go
insert into sc values('95001','2','85')
go
insert into sc values('95001','3','88')
go
insert into sc values('95002','2','90')
go
insert into sc values('95002','3','80')
go
select * from sc
go
delete from sc
go
delete from student
go
delete from course
go