select city,cate,pp,cnt
from
(
select city,cate,pp,cnt
,rn=row_number() over(partition by city,cate order by cnt desc)
from tb
) t
where rn<=3
from
(
select city,cate,pp,cnt
,rn=row_number() over(partition by city,cate order by cnt desc)
from tb
) t
where rn<=3
---------------------------------
-- Author: htl258(Tony)
-- Date : 2009-07-02 15:11:55
---------------------------------
--> 生成测试数据表-tbif not object_id('tb') is null
drop table tb
Go
Create table tb([City] nvarchar(2),[Cate] nvarchar(5),[Pp] nvarchar(6),[Cnt] int)
Insert tb
select 'AL','白酒','劲牌',2 union all
select 'AL','白酒','枝江',2 union all
select 'AL','白酒','黄鹤楼',1 union all
select 'AL','白酒','安陆',1 union all
select 'AL','白酒','关公坊',1 union all
select 'AL','白酒','白云边',1 union all
select 'AL','白酒','稻花稻花香',1 union all
select 'AL','白酒','泸贡王',1 union all
select 'AL','包装饮用水','益智泉',22 union all
select 'AL','包装饮用水','乐百氏',2 union all
select 'AL','包装饮用水','小家伙纯之恋',1 union all
select 'AL','包装饮用水','安洁',1 union all
select 'AL','包装饮用水','康师傅',1 union all
select 'AL','包装饮用水','蓝智泉',1 union all
select 'AL','保健滋补品','脑白金',1 union all
select 'AL','饼干','吉人',6 union all
select 'AL','饼干','真巧',3 union all
select 'AL','饼干','旺旺',3 union all
select 'AL','饼干','奇客王子',3 union all
select 'AL','饼干','旺仔',2 union all
select 'AL','饼干','达利园',2 union all
select 'AL','饼干','徐福记',10 union all
select 'AL','饼干','奇客',1 union all
select 'AL','饼干','熔情',1 union all
select 'AL','饼干','开心点点',1
Go
--Select * from tb -->SQL查询如下:
select *
from
(
select
rn=row_number() over(partition by City,cate order by cnt desc),
*
from
tb
) as t
where
rn<=3
/*
rn City Cate Pp Cnt
-------------------- ---- ----- ------ -----------
1 AL 白酒 劲牌 2
2 AL 白酒 枝江 2
3 AL 白酒 黄鹤楼 1
1 AL 包装饮用水 益智泉 22
2 AL 包装饮用水 乐百氏 2
3 AL 包装饮用水 小家伙纯之恋 1
1 AL 保健滋补品 脑白金 1
1 AL 饼干 徐福记 10
2 AL 饼干 吉人 6
3 AL 饼干 真巧 3(10 行受影响)*/
-- Author: liangCK 小梁
-- Title : 查每个分组前N条记录
-- Date : 2008-11-13 17:19:23
-----------------------------------> 生成测试数据: #T
IF OBJECT_ID('tempdb.dbo.#T') IS NOT NULL DROP TABLE #T
CREATE TABLE #T (ID VARCHAR(3),GID INT,Author VARCHAR(29),Title VARCHAR(39),Date DATETIME)
INSERT INTO #T
SELECT '001',1,'邹建','深入浅出SQLServer2005开发管理与应用实例','2008-05-10' UNION ALL
SELECT '002',1,'胡百敬','SQLServer2005性能调校','2008-03-22' UNION ALL
SELECT '003',1,'格罗夫Groff.J.R.','SQL完全手册','2009-07-01' UNION ALL
SELECT '004',1,'KalenDelaney','SQLServer2005技术内幕存储引擎','2008-08-01' UNION ALL
SELECT '005',2,'Alex.Kriegel.Boris.M.Trukhnov','SQL宝典','2007-10-05' UNION ALL
SELECT '006',2,'飞思科技产品研发中心','SQLServer2000高级管理与开发','2007-09-10' UNION ALL
SELECT '007',2,'胡百敬','SQLServer2005数据库开发详解','2008-06-15' UNION ALL
SELECT '008',3,'陈浩奎','SQLServer2000存储过程与XML编程','2005-09-01' UNION ALL
SELECT '009',3,'赵松涛','SQLServer2005系统管理实录','2008-10-01' UNION ALL
SELECT '010',3,'黄占涛','SQL技术手册','2006-01-01'--SQL查询如下:--按GID分组,查每个分组中Date最新的前2条记录
--1.字段ID唯一时:
SELECT * FROM #T AS T WHERE ID IN(SELECT TOP 2 ID FROM #T WHERE GID=T.GID ORDER BY Date DESC)--2.如果ID不唯一时:
SELECT * FROM #T AS T WHERE 2>(SELECT COUNT(*) FROM #T WHERE GID=T.GID AND Date>T.Date)--SQL Server 2005 使用新方法--3.使用ROW_NUMBER()进行排位分组
SELECT ID,GID,Author,Title,Date
FROM
(
SELECT rid=ROW_NUMBER() OVER(PARTITION BY GID ORDER BY Date DESC),*
FROM #T
) AS T
WHERE rid<=2--4.使用APPLY
SELECT DISTINCT b.*
FROM #T AS a
CROSS APPLY
(
SELECT TOP(2) * FROM #T WHERE a.GID=GID ORDER BY Date DESC
) AS b
--结果
/*ID GID Author Title Date
---- ----------- ----------------------------- --------------------------------------- -----------------------
003 1 格罗夫Groff.J.R. SQL完全手册 2009-07-01 00:00:00.000
004 1 KalenDelaney SQLServer2005技术内幕存储引擎 2008-08-01 00:00:00.000
005 2 Alex.Kriegel.Boris.M.Trukhnov SQL宝典 2007-10-05 00:00:00.000
007 2 胡百敬 SQLServer2005数据库开发详解 2008-06-15 00:00:00.000
009 3 赵松涛 SQLServer2005系统管理实录 2008-10-01 00:00:00.000
010 3 黄占涛 SQL技术手册 2006-01-01 00:00:00.000(6 行受影响)
*/
本文来自CSDN博客,转载请标明出处:http://blog.csdn.net/htl258/archive/2009/04/13/4066478.aspx
---------------------------------
-- Author: htl258(Tony)
-- Date : 2009-07-02 15:34:55
---------------------------------
--> 生成测试数据表-tbif not object_id('tb') is null
drop table tb
Go
Create table tb([City] nvarchar(2),[Cate] nvarchar(5),[Pp] nvarchar(6),[Cnt] int)
Insert tb
select 'AL','白酒','劲牌',2 union all
select 'AL','白酒','枝江',2 union all
select 'AL','白酒','黄鹤楼',1 union all
select 'AL','白酒','安陆',1 union all
select 'AL','白酒','关公坊',1 union all
select 'AL','白酒','白云边',1 union all
select 'AL','白酒','稻花稻花香',1 union all
select 'AL','白酒','泸贡王',1 union all
select 'AL','包装饮用水','益智泉',22 union all
select 'AL','包装饮用水','乐百氏',2 union all
select 'AL','包装饮用水','小家伙纯之恋',1 union all
select 'AL','包装饮用水','安洁',1 union all
select 'AL','包装饮用水','康师傅',1 union all
select 'AL','包装饮用水','蓝智泉',1 union all
select 'AL','保健滋补品','脑白金',1 union all
select 'AL','饼干','吉人',6 union all
select 'AL','饼干','真巧',3 union all
select 'AL','饼干','旺旺',3 union all
select 'AL','饼干','奇客王子',3 union all
select 'AL','饼干','旺仔',2 union all
select 'AL','饼干','达利园',2 union all
select 'AL','饼干','徐福记',10 union all
select 'AL','饼干','奇客',1 union all
select 'AL','饼干','熔情',1 union all
select 'AL','饼干','开心点点',1
Go
--Select * from tb -->SQL2000查询如下:
alter table tb add rn int identity
go
select City,Cate,Pp,Cnt
from tb t
where rn in(
select top 3 rn
from tb
where city=t.city
and cate=t.cate
order by cnt desc)
order by city,cate,cnt descalter table tb drop column rn
go
/*
City Cate Pp Cnt
---- ----- ------ -----------
AL 白酒 劲牌 2
AL 白酒 枝江 2
AL 白酒 安陆 1
AL 包装饮用水 益智泉 22
AL 包装饮用水 乐百氏 2
AL 包装饮用水 安洁 1
AL 保健滋补品 脑白金 1
AL 饼干 徐福记 10
AL 饼干 吉人 6
AL 饼干 奇客王子 3(10 行受影响)*/
from
(
select city,cate,pp,cnt
,rn=(select count(*) from tb where city=t.city and cate=t.cate and (cnt>t.cnt or cnt=t.cnt and pp>t.pp))
from tb t
) tt
where rn<=2
/*
city cate pp cnt
---- ----- ------ -----------
AL 白酒 劲牌 2
AL 白酒 枝江 2
AL 白酒 泸贡王 1
AL 包装饮用水 益智泉 22
AL 包装饮用水 乐百氏 2
AL 包装饮用水 小家伙纯之恋 1
AL 保健滋补品 脑白金 1
AL 饼干 吉人 6
AL 饼干 真巧 3
AL 饼干 徐福记 10(10 行受影响)
*/