使用SQL创建视图和存储过程

CREATE VIEW F_Student
AS 
SELECT *
FROM  Student
WHERE  Sex='女'

SELECT COUNT(*)
FROM F_Student
WHERE Sage<18

CREATE VIEW CS_Student
AS 
SELECT Sno,Sname,Sex,Sage,Sdept
FROM  Student
WHERE  Sdept= '计算机系'
WITH CHECK OPTION

INSERT INTO CS_Student
VALUES('19250101','王芳','女',20,'计算机系')
有限制：所插入的数据在Sdept列上必须是“计算机系”
5.通过视图CS_Student删除姓名为“徐庆”的学生记录，能否成功？为什么？（10分）
DELETE FROM CS_Student
WHERE Sname='徐庆'
go
--执行结果显示0行受影响,则说明未删除成功
SELECT *
FROM Student
WHERE Sname='徐庆'
go
--执行查询依然可看到该生信息
原因：徐庆并非“计算机系”学生，因此无法透过视图“CS_Student”来实现删除功能。

CREATE VIEW DB_SC(Sno,Sname,Sdept,Cname,Score)
AS
SELECT Student.Sno,Sname,Sdept,Course.Cname,Score
FROM Student,SC,Course
WHERE Student.Sno=SC.Sno AND SC.Cno=Course.Cno AND Cname='数据库原理'

CREATE VIEW DB_SC_60
AS
SELECT *
FROM DB_SC
WHERE Score>=60
8.将每门课程及其平均分建立视图，视图名自定义（5分）
CREATE VIEW Cour_AVG(Cno,Cavg)
AS
SELECT Cno, AVG(Score)
FROM SC
GROUP BY Cno
go
Select *
from Cour_AVG
GO

ALTER VIEW F_Student
AS 
SELECT *
FROM  Student
WHERE  Sex='男'

DROP VIEW F_Student

CREATE PROCEDURE PROC_STU
AS
SELECT *
FROM Student
GO
EXEC PROC_STU
go

CREATE PROCEDURE PROC_SELECT_SEX_COUNT
AS
SELECT Sex,COUNT(Sno)
FROM Student
GROUP BY Sex
GO
EXEC PROC_SELECT_SEX_COUNT
GO

CREATE PROCEDURE PROC_SELECT_COUNT_BYDEPT
@Dept varchar(50)
AS
SELECT COUNT(Sno)
FROM Student
WHERE Sdept=@Dept
GROUP BY Sdept
go
EXEC PROC_SELECT_COUNT_BYDEPT '计算机系'
go

CREATE PROCEDURE PROC_COURSE_PRE
@cname varchar(50),@precname varchar(50) OUTPUT
AS
SELECT @precname=Cname
FROM Course
WHERE Cno IN(SELECT Cpno
FROM Course
WHERE Cname=@cname)
GO
DECLARE @name varchar(50),@pre varchar(50)
SET @name='数据库原理'
EXEC PROC_COURSE_PRE @name,@pre OUTPUT
PRINT @pre
go