T-SQL的高级查询详解--分组查询

 

 

1．      

CourseID

SQL serverGroup BySQLSelect CourseID, Avg(Score) as From Score

 

Group By CourseID

 

 

 

SQLSelect StudentID as ,CourseID as , Avg(Score) as

 

From Score

Group By StudentID,CourseID

Group By select select 2.Having“”

Count score >1 Having

SQL

Select StudentID as ,CourseID as ,

Avg(Score) as

From Score

Group By StudentID,CourseID

Having Count(Score)>1

3. —

WHERE

GROUP BY

HAVING

1: “2000 ”

Select , Count(*)

From Where >= 2000

GROUP BY Having Count(*) > 1

2: 08 2 7

Select CAST (DATEPART(YEAR,paytime) as varchar(10))+' '+ CAST (DATEPART(MONTH,paytime) as varchar(10))+' ' AS ,Sum(CHARGE) From "history-accountbill Where isPaid<>0 AND

paytime between '2008-02-01 00:00:00' and '2008-7-31 23:59:59'

Group By CAST (DATEPART(YEAR,paytime) as varchar(10))+' '+ CAST (DATEPART(MONTH,paytime) as Varchar(10))+' '

 

 

本文出自 “ 风水云天--乐成 著” 博客，请务必保留此出处 http://yueyuanyuan.blog.51cto.com/1342062/308496

本文出自 51CTO.COM技术博客