sql查詢每個班上成績最高的學生資訊

sql查詢每個班上成績最高的學生資訊

資料庫表和資料準備：

if exists (select * from sysobjects where id = object_id('[classinfo]') and objectproperty(id, 'isusertable') = 1) 

drop table [classinfo]
create table [classinfo] (
[id] [bigint]  not null,
[classid] [bigint]  not null,
[classname] [nvarchar]  (50) not null,
[stat] [varchar]  (2) not null default (1),
[autoid] [bigint]  identity (1, 1)  not null)
alter table [classinfo] with nocheck add  constraint [pk_classinfo] primary key  nonclustered ( [id] )
set identity_insert [classinfo] on
insert [classinfo] ([id],[classid],[classname],[stat],[autoid]) values ( 1,1,n'計算機一班',n'1',1)
insert [classinfo] ([id],[classid],[classname],[stat],[autoid]) values ( 2,2,n'計算機二班',n'1',2)
insert [classinfo] ([id],[classid],[classname],[stat],[autoid]) values ( 4,3,n'計算機三班',n'0',3)
insert [classinfo] ([id],[classid],[classname],[stat],[autoid]) values ( 5,4,n'計算機四班',n'1',4)
insert [classinfo] ([id],[classid],[classname],[stat],[autoid]) values ( 6,5,n'計算機五班',n'1',6)
set identity_insert [classinfo] off
if exists (select * from sysobjects where id = object_id('[stuinfo]') and objectproperty(id, 'isusertable') = 1) 
drop table [stuinfo]
create table [stuinfo] (
[id] [bigint]  identity (1, 1)  not null,
[username] [nvarchar]  (50) null,
[userpwd] [nvarchar]  (50) null,
[classid] [bigint]  null,
[score] [numeric]  (10,2) null,
[age] [int]  null,
[createtime] [datetime]  null default (getdate()))
alter table [stuinfo] with nocheck add  constraint [pk_stuinfo] primary key  nonclustered ( [id] )
set identity_insert [stuinfo] on
insert [stuinfo] ([id],[username],[userpwd],[classid],[score],[age],[createtime]) values ( 1,n'001',n'0004',1,123.22,25,n'2012/8/24 10:58:10')
insert [stuinfo] ([id],[username],[userpwd],[classid],[score],[age],[createtime]) values ( 2,n'002',n'154',2,888.00,21,n'2012/8/24 10:58:10')
insert [stuinfo] ([id],[username],[userpwd],[classid],[score],[age],[createtime]) values ( 3,n'003',n'555',1,888.00,16,n'2012/8/24 10:58:10')
insert [stuinfo] ([id],[username],[userpwd],[classid],[score],[age],[createtime]) values ( 4,n'004',n'644',2,85.60,18,n'2012/8/24 10:58:10')
insert [stuinfo] ([id],[username],[userpwd],[classid],[score],[age],[createtime]) values ( 5,n'pkm',n'123',3,46.00,19,n'2012/8/24 10:58:10')
insert [stuinfo] ([id],[username],[userpwd],[classid],[score],[age],[createtime]) values ( 6,n'pkm001',n'123',3,45.56,19,n'2012/8/24 10:58:10')
insert [stuinfo] ([id],[username],[classid],[createtime]) values ( 7,n'2012pkm1',1,n'2012/8/24 10:58:10')
set identity_insert [stuinfo] off

select distinct si.id,si.username,si.score,si.classid,ci.classname 

from stuinfo as si
inner join
(select max(score) as score ,classid from stuinfo
group by classid 
)as c1
on c1.score = si.score
inner join classinfo as ci
on ci.classid = si.classid
order by si.classid

查詢結果：

附：刪除重複username記錄，只保留最小的id

delete from stuinfo

where id not in
(select si.id
from stuinfo as si  
inner join  
(  select min(id) as id ,username from stuinfo  
group by username   
)  as c1  
on c1.id = si.id  
)---或者
delete from stuinfo where id not in
(select min(id) from stuinfo group by username)

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