sql 查询每科的前三名

废话不多说，直接上脚本 

CREATE TABLE [dbo].[Students](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [name] [nchar](20) NULL,
    [kemu] [nchar](20) NULL,
    [score] [int] NOT NULL,
 CONSTRAINT [PK_Students] PRIMARY KEY CLUSTERED 
(
    [ID] 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

insert into Students values('张三','语文',66)
insert into Students values('李四','语文',67)
insert into Students values('王五','语文',68)
insert into Students values('赵六','语文',69)
insert into Students values('天气','语文',70)
insert into Students values('王八','语文',72)
insert into Students values('幺九','语文',75)
insert into Students values('大十','语文',80)



insert into Students values('张三','数学',85)
insert into Students values('李四','数学',80)
insert into Students values('王五','数学',75)
insert into Students values('赵六','数学',69)
insert into Students values('天气','数学',68)
insert into Students values('王八','数学',67)
insert into Students values('幺九','数学',66)
insert into Students values('大十','数学',65)


insert into Students values('张三','英语',60)
insert into Students values('李四','英语',72)
insert into Students values('王五','英语',76)
insert into Students values('赵六','英语',77)
insert into Students values('天气','英语',85)
insert into Students values('王八','英语',78)
insert into Students values('幺九','英语',75)
insert into Students values('大十','英语',71)

查询语句：内层中  WHERE B.kemu = A.kemu  其实相当于 拿外层的 name  分组 group  by 

SELECT * 
FROM Students A
WHERE name IN (SELECT TOP 3 name
                       FROM Students B
                      WHERE B.kemu = A.kemu
                      ORDER BY B.score DESC)
ORDER BY A.kemu, A.score DESC

运行结果：