????1 ???
?????????????????????????????°????????????????????????????dll???????????????????????ж?????д??SQL????????????????
???????????????￡?
????Department(depID?? depName)??depID ?????DepName???
????Student(stuID?? name?? depID) ?????????????????
????Score(stuID?? category?? score) ???????????????
????????????????????????????????????????У???????????????????
??????????????????????????????
????2 ???
USE [test]
GO
/****** Object:  Table [dbo].[Score]    Script Date: 05/11/2015 23:16:23 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[Score](
[stuID] [int] NOT NULL??
[category] [varchar](50) NOT NULL??
[score] [int] NOT NULL
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
INSERT [dbo].[Score] ([stuID]?? [category]?? [score]) VALUES (1?? N'???'?? 80)
INSERT [dbo].[Score] ([stuID]?? [category]?? [score]) VALUES (2?? N'???'?? 80)
INSERT [dbo].[Score] ([stuID]?? [category]?? [score]) VALUES (1?? N'???'?? 70)
INSERT [dbo].[Score] ([stuID]?? [category]?? [score]) VALUES (2?? N'???'?? 89)
INSERT [dbo].[Score] ([stuID]?? [category]?? [score]) VALUES (3?? N'???'?? 81)
INSERT [dbo].[Score] ([stuID]?? [category]?? [score]) VALUES (3?? N'???'?? 71)
INSERT [dbo].[Score] ([stuID]?? [category]?? [score]) VALUES (4?? N'???'?? 91)
INSERT [dbo].[Score] ([stuID]?? [category]?? [score]) VALUES (4?? N'???'?? 61)
INSERT [dbo].[Score] ([stuID]?? [category]?? [score]) VALUES (5?? N'???'?? 91)
INSERT [dbo].[Score] ([stuID]?? [category]?? [score]) VALUES (6?? N'???'?? 89)
INSERT [dbo].[Score] ([stuID]?? [category]?? [score]) VALUES (7?? N'???'?? 77)
INSERT [dbo].[Score] ([stuID]?? [category]?? [score]) VALUES (8?? N'???'?? 97)
INSERT [dbo].[Score] ([stuID]?? [category]?? [score]) VALUES (9?? N'???'?? 57)
INSERT [dbo].[Score] ([stuID]?? [category]?? [score]) VALUES (5?? N'???'?? 87)
INSERT [dbo].[Score] ([stuID]?? [category]?? [score]) VALUES (6?? N'???'?? 89)
INSERT [dbo].[Score] ([stuID]?? [category]?? [score]) VALUES (7?? N'???'?? 80)
INSERT [dbo].[Score] ([stuID]?? [category]?? [score]) VALUES (8?? N'???'?? 81)
INSERT [dbo].[Score] ([stuID]?? [category]?? [score]) VALUES (9?? N'???'?? 84)
/****** Object:  Table [dbo].[Department]    Script Date: 05/11/2015 23:16:23 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[Department](
[depID] [int] IDENTITY(1??1) NOT NULL??
[depName] [varchar](50) NOT NULL??
PRIMARY KEY CLUSTERED
(
[depID] ASC
)WITH (PAD_INDEX  = OFF?? STATISTICS_NORECOMPUTE  = OFF?? IGNORE_DUP_KEY = OFF?? ALLOW_ROW_LOCKS  = ON?? ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
SET IDENTITY_INSERT [dbo].[Department] ON
INSERT [dbo].[Department] ([depID]?? [depName]) VALUES (1?? N'?????')
INSERT [dbo].[Department] ([depID]?? [depName]) VALUES (2?? N'????')
INSERT [dbo].[Department] ([depID]?? [depName]) VALUES (3?? N'???')
SET IDENTITY_INSERT [dbo].[Department] OFF
/****** Object:  Table [dbo].[Student]    Script Date: 05/11/2015 23:16:23 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[Student](
[stuID] [int] IDENTITY(1??1) NOT NULL??
[stuName] [varchar](50) NOT NULL??
[deptID] [int] NOT NULL??
PRIMARY KEY CLUSTERED
(
[stuID] ASC
)WITH (PAD_INDEX  = OFF?? STATISTICS_NORECOMPUTE  = OFF?? IGNORE_DUP_KEY = OFF?? ALLOW_ROW_LOCKS  = ON?? ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
SET IDENTITY_INSERT [dbo].[Student] ON
INSERT [dbo].[Student] ([stuID]?? [stuName]?? [deptID]) VALUES (1?? N'?????????'?? 1)
INSERT [dbo].[Student] ([stuID]?? [stuName]?? [deptID]) VALUES (2?? N'?????????'?? 1)
INSERT [dbo].[Student] ([stuID]?? [stuName]?? [deptID]) VALUES (3?? N'?????????'?? 1)
INSERT [dbo].[Student] ([stuID]?? [stuName]?? [deptID]) VALUES (4?? N'????amy'?? 2)
INSERT [dbo].[Student] ([stuID]?? [stuName]?? [deptID]) VALUES (5?? N'????kity'?? 2)
INSERT [dbo].[Student] ([stuID]?? [stuName]?? [deptID]) VALUES (6?? N'????lucky'?? 2)
INSERT [dbo].[Student] ([stuID]?? [stuName]?? [deptID]) VALUES (7?? N'???_yiming'?? 3)
INSERT [dbo].[Student] ([stuID]?? [stuName]?? [deptID]) VALUES (8?? N'???_haoxue'?? 3)
INSERT [dbo].[Student] ([stuID]?? [stuName]?? [deptID]) VALUES (9?? N'???_wuyong'?? 3)
SET IDENTITY_INSERT [dbo].[Student] OFF
/****** Object:  Default [DF__Departmen__depNa__5441852A]    Script Date: 05/11/2015 23:16:23 ******/
ALTER TABLE [dbo].[Department] ADD  DEFAULT ('') FOR [depName]
GO
/****** Object:  Default [DF__Score__category__5EBF139D]    Script Date: 05/11/2015 23:16:23 ******/
ALTER TABLE [dbo].[Score] ADD  DEFAULT ('') FOR [category]
GO
/****** Object:  Default [DF__Score__score__5FB337D6]    Script Date: 05/11/2015 23:16:23 ******/
ALTER TABLE [dbo].[Score] ADD  DEFAULT ((0)) FOR [score]
GO
/****** Object:  Default [DF__Student__stuName__59063A47]    Script Date: 05/11/2015 23:16:23 ******/
ALTER TABLE [dbo].[Student] ADD  DEFAULT ('') FOR [stuName]
GO
/****** Object:  ForeignKey [FK__Student__deptID__59FA5E80]    Script Date: 05/11/2015 23:16:23 ******/
ALTER TABLE [dbo].[Student]  WITH CHECK ADD FOREIGN KEY([deptID])
REFERENCES [dbo].[Department] ([depID])
GO
???????????
????3 ???
???????????????д????????????????????????t????д?????sql??????????2??3??С????????????????????????и????д????
-- ????????????????
SELECT Department.depID?? Department.depName?? Student.stuID?? stuName?? Dscore.scores
FROM Department
LEFT JOIN Student
on department.depID = student.deptID
LEFT JOIN (SELECT Score.stuId?? SUM(Score) AS scores
FROM Score
GROUP by stuID
) AS Dscore
on Student.stuID = dScore.stuID
where exists    (
select *
from
(
SELECT deptID?? MAX(scores) AS topScores
FROM Student
LEFT JOIN
(
SELECT stuID??SUM(score) AS scores
FROM Score
GROUP BY stuID) AS newScore
ON Student.stuID = newScore.stuID
group by deptID) AS depScore
where Department.depID = depScore.deptID and Dscore.scores=depScore.topScores
)
order by Department.depID??Student.stuID;