对应于student数据库
(1) 创建一个无参存储过程StuScoreInfo,查询以下信息:学号,姓名,性别,课程名称,考试成绩.
use Student
go
create proc StuScoreInfo
as select student.sno,sname,ssex,cname,sc.gradefrom student,course,sc
wherestudent.sno=sc.sno and course.cno=sc.cno
go
exec StuScoreInfo
(2) 创建一个带参数的存储过程stu_info,该存储过程根据传入的学生编号在student表中查询此学生的信息.
CREATE PROCstu_info
@NAME VARCHAR(20)
AS
SELECT *
FROM Student
WHERE Sname=@NAME
GO
EXEC stu_info '李勇'
(3) 创建一个带参数的存储过程StuScoreInfo2,该存储过程根据传入的学生编号和课程名称查询以下信息:姓名,课程名称,考试成绩.
CREATE PROCStuScoreInfo2
@NAME1VARCHAR(20),
@NAME2VARCHAR(20)
AS
SELECTsname,cname,grade
FROMstudent,course,sc
WHEREstudent.sno=sc.sno and course.cno=sc.cno and student.sno=@NAME1 andcourse.cname=@NAME2
GO
EXECStuScoreInfo2 '201215121','数据库'
(4) 编写带参数的存储过程,根据传入的课程名称统计该课程的平均成绩.
create procTheAvg
@NAME VARCHAR(20)
as
select AVG(Grade)平均值 from Course,SC
wheresc.Cno=Course.cno and Course.Cname=@NAME
go
exec TheAvg '数学'
(5) 查询选了某门课的选课人数(使用输出参数)
create proc TheNum
@course varchar(20) output,
@num int output
as
select @course=Cname,@num=count(*) from Course,SC
where sc.Cno=Course.cno
group by Cname
go
declare @name char(20),@num char(20)
exec TheNum @name output,@numoutput
select @name ,@num
(6) 根据各种错误设置不同的返回代码值。查询指定学号的学生的考试平均成绩，1，执行成功，0，未指定学号，2指定的学号不存在，3指定的学号没有选课。
create proc TheOver(@sno varchar(20))
as
if not exists(select * fromStudent where Sno =@sno)
begin
print '2指定的学号不存在'
end
else if not exists(select *from Student where @sno not in(select Sno from Course))
begin
print '3指定的学号没有选课'
end
else if exists(select * fromSC where Sno=@sno)
begin
select AVG(Grade) 平均值 from SC where Sno=@sno
print '1执行成功了'
end
else
begin
print '0未指定学号'
end
go
exec TheOver '200215121'
