T-SQL的高級查詢詳解--分組查詢

 

 

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 Byselectselect2.Having“”

Countscore>1Having

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: 0827

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))+''

 

 

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