sql查询每个班上成绩最高的学生信息
数据库表和数据准备：
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] ONINSERT [classinfo] ([id],[classID],[className],[stat],[autoid]) VALUES ( 1,1,N'计算机一班',N'1',1)INSERT [classinfo] ([id],[classID],[className],[stat],[autoid]) VALUES ( 2,2,N'计算机二班',N'1',2)INSERT [classinfo] ([id],[classID],[className],[stat],[autoid]) VALUES ( 4,3,N'计算机三班',N'0',3)INSERT [classinfo] ([id],[classID],[className],[stat],[autoid]) VALUES ( 5,4,N'计算机四班',N'1',4)INSERT [classinfo] ([id],[classID],[className],[stat],[autoid]) VALUES ( 6,5,N'计算机五班',N'1',6)SET IDENTITY_INSERT [classinfo] OFFif 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] ONINSERT [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查询每班最高分数的sql语句：
select distinct si.id,si.username,si.score,si.classID,ci.className from stuinfo as siinner join(select max(score) as score ,classID from stuinfogroup by classID )as c1on c1.score = si.scoreinner join classinfo as cion ci.classID = si.classIDorder by si.classID
原始数据：
查询结果：
