T-SQL 视图

Posted 2021-01-24 spinoza

 1 use StudentManager
 2 go
 3 --判断视图是否存在
 4 if exists(select * from sysobjects where name=‘view_ScoreQuery‘)
 5 drop view view_ScoreQuery
 6 go
 7 --创建视图
 8 create view view_ScoreQuery
 9 as
10     select top 1000 Students.StudentId,StudentName,ClassName,
11              C#=CSharp,SQLDB=SQLServerDB,
12              ScoreSum=(CSharp+SQLServerDB) from Students
13              inner join ScoreList on Students.StudentId=ScoreList.StudentId
14              inner join StudentClass on Students.ClassId=StudentClass.ClassId
15              order by StudentClass.ClassId
16 go
17 --使用视图查询
18 select * from view_ScoreQuery

视图里面如果想用order by 排序,必须要加入top,所以视图里不建议加order by ,想要加order by 建议在调用视图的时候加