1.什么是视图？

2.手动创建视图

3.代码创建视图

4.使用视图的注意事项

案例代码：

use StudentManager
go
--判断视图是否存在
if exists(select * from sysobjects where name='view_ScoreQuery')
drop view view_ScoreQuery
go
--创建视图
create view view_ScoreQuery
as
	select top 1000 Students.StudentId,StudentName,ClassName,
             C#=CSharp,SQLDB=SQLServerDB,
             ScoreSum=(CSharp+SQLServerDB) from Students
             inner join ScoreList on Students.StudentId=ScoreList.StudentId
             inner join StudentClass on Students.ClassId=StudentClass.ClassId
             order by StudentClass.ClassId
go
--使用视图查询
select * from view_ScoreQuery