---------------------------------
-- 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)
*/
-- 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)
*/
from
(
select 考核工资,count(*) as Num
from tb
group by 考核工资
order by Num
) A
from tb A
group by 班组
create table #ta(日期 datetime,班组 varchar(20),工号 varchar(50),姓名 varchar(50),员工ID int,考核工资 decimal(18,3),工时 decimal(18,2),实际工资 decimal(18,3))
insert #ta
select '2008-11-01','八线','A0001892','许丽丽',8756, 34.000, 8.00, 34.000 union all
select '2008-11-01','八线','A0608161','步秀华',10493, 34.006, 8.00, 18.218 union all
select '2008-11-01','八线','A0608168','胡玉娟',8917, 34.000, 8.00, 34.000 union all
select '2008-11-01','八线','A0708052','梁劝劝',15869, 34.000, 8.00, 40.460 union all
select '2008-11-01','八线','A0709046','刘林英',16128, 34.000, 8.00, 40.460 union all
select '2008-11-01','八线','A0709052','时春萍',16134, 34.000, 8.00, 34.000 union all
select '2008-11-01','八线','A0712061','石六英',19490, 30.000, 8.00, 30.000 union all
select '2008-11-01','八线','A0805018','张玲',21608, 30.000, 8.00, 30.000 union all
select '2008-11-01','二线','A0810062','郭庆',20595, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0809083','何孟林',23122, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0804058','邱清芬',8503, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0802395','鲜海波',20374, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0712108','卢长菊',10395, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0711091','赵琴林',19342, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0711026','刘先健',19232, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0711051','李纽纽',19283, 49.535, 9.00, 52.220 ---查询---
select 班组,考核工资,count(考核工资) as 出现次数
into #tb
from #ta
group by 班组,考核工资select *
from #tb t
where not exists(select *from #tb where 班组=t.班组 and 出现次数>t.出现次数)---结果---
班组 考核工资 出现次数
-------------------- -------------------- -----------
八线 34.000 5
二线 49.535 8(所影响的行数为 2 行)
这样?
---查询---
select 班组,convert(char(10),日期,120) as 日期,考核工资,count(考核工资) as 出现次数
into #tb
from #ta
group by 班组,日期,考核工资select *
from #tb t
where not exists(select *from #tb where 班组=t.班组 and 出现次数>t.出现次数)---结果---
班组 日期 考核工资 出现次数
-------------------- ---------- -------------------- -----------
八线 2008-11-01 34.000 5
二线 2008-11-01 49.535 8(所影响的行数为 2 行)
create table #ta(日期 datetime,班组 varchar(20),工号 varchar(50),姓名 varchar(50),员工ID int,考核工资 decimal(18,3),工时 decimal(18,2),实际工资 decimal(18,3))
insert #ta
select '2008-11-01','八线','A0001892','许丽丽',8756, 34.000, 8.00, 34.000 union all
select '2008-11-01','八线','A0608161','步秀华',10493, 34.006, 8.00, 18.218 union all
select '2008-11-01','八线','A0608168','胡玉娟',8917, 34.000, 8.00, 34.000 union all
select '2008-11-01','八线','A0708052','梁劝劝',15869, 34.000, 8.00, 40.460 union all
select '2008-11-01','八线','A0709046','刘林英',16128, 34.000, 8.00, 40.460 union all
select '2008-11-01','八线','A0709052','时春萍',16134, 34.000, 8.00, 34.000 union all
select '2008-11-01','八线','A0712061','石六英',19490, 30.000, 8.00, 30.000 union all
select '2008-11-01','八线','A0805018','张玲',21608, 30.000, 8.00, 30.000 union all
select '2008-11-01','二线','A0810062','郭庆',20595, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0809083','何孟林',23122, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0804058','邱清芬',8503, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0802395','鲜海波',20374, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0712108','卢长菊',10395, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0711091','赵琴林',19342, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0711026','刘先健',19232, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0711051','李纽纽',19283, 49.535, 9.00, 52.220 --最笨的查询
select a.* from
(select 班组,count(考核工资) 出现次数,考核工资,日期 from #ta group by 班组,考核工资,日期) a
inner join
(select b.班组,b.日期,max(b.出现次数) 出现次数 from
(select 班组,count(考核工资) 出现次数,考核工资,日期 from #ta group by 班组,考核工资,日期) b
group by b.班组,b.日期 ) c
on a.班组=c.班组 and a.出现次数=c.出现次数 and a.日期=c.日期--查询结果
/*
班组 出现次数 考核工资 日期
二线 8 49.535 2008-11-01 00:00:00.000
八线 5 34.000 2008-11-01 00:00:00.000
*/最笨的写法,鄙视一下自己
insert #ta
select '2008-11-01','八线','A0001892','许丽丽',8756, 34.000, 8.00, 34.000 union all
select '2008-11-01','八线','A0608161','步秀华',10493, 34.006, 8.00, 18.218 union all
select '2008-11-01','八线','A0608168','胡玉娟',8917, 34.000, 8.00, 34.000 union all
select '2008-11-01','八线','A0708052','梁劝劝',15869, 34.000, 8.00, 40.460 union all
select '2008-11-01','八线','A0709046','刘林英',16128, 34.000, 8.00, 40.460 union all
select '2008-11-01','八线','A0709052','时春萍',16134, 34.000, 8.00, 34.000 union all
select '2008-11-01','八线','A0712061','石六英',19490, 30.000, 8.00, 30.000 union all
select '2008-11-01','八线','A0805018','张玲',21608, 30.000, 8.00, 30.000 union all
select '2008-11-01','二线','A0810062','郭庆',20595, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0809083','何孟林',23122, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0804058','邱清芬',8503, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0802395','鲜海波',20374, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0712108','卢长菊',10395, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0711091','赵琴林',19342, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0711026','刘先健',19232, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0711051','李纽纽',19283, 49.535, 9.00, 52.220 select 班组,考核工资,count(*)num into #b
from #ta
group by 班组,考核工资
select * from #b b
where (select count(*) from #b where 班组=b.班组 and num>b.num )<1
drop table #ta,#b
create table #ta(日期 datetime,班组 varchar(20),工号 varchar(50),姓名 varchar(50),员工ID int,考核工资 decimal(18,3),工时 decimal(18,2),实际工资 decimal(18,3))
insert #ta
select '2008-11-01','八线','A0001892','许丽丽',8756, 34.000, 8.00, 34.000 union all
select '2008-11-01','八线','A0608161','步秀华',10493, 34.006, 8.00, 18.218 union all
select '2008-11-01','八线','A0608168','胡玉娟',8917, 34.000, 8.00, 34.000 union all
select '2008-11-01','八线','A0708052','梁劝劝',15869, 34.000, 8.00, 40.460 union all
select '2008-11-01','八线','A0709046','刘林英',16128, 34.000, 8.00, 40.460 union all
select '2008-11-01','八线','A0709052','时春萍',16134, 34.000, 8.00, 34.000 union all
select '2008-11-01','八线','A0712061','石六英',19490, 30.000, 8.00, 30.000 union all
select '2008-11-01','八线','A0805018','张玲',21608, 30.000, 8.00, 30.000 union all
select '2008-11-01','二线','A0810062','郭庆',20595, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0809083','何孟林',23122, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0804058','邱清芬',8503, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0802395','鲜海波',20374, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0712108','卢长菊',10395, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0711091','赵琴林',19342, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0711026','刘先健',19232, 49.535, 9.00, 52.220 union all
select '2008-11-01','二线','A0711051','李纽纽',19283, 49.535, 9.00, 52.220 select 班组,考核工资,日期, count(*)num into #b
from #ta
group by 班组,考核工资,日期
select * from #b b
where (select count(*) from #b where 班组=b.班组 and 日期=b.日期 and num>b.num )<1
drop table #ta,#b
2、对1中得到的表,按照班组、日期PARTITION,按照COUNT做DESC RDER BY并得到ROW_NUMBER()]
3、对2中的表,取ROW_NUMBER()的结果=1的不要老是想别人帮你把代码写好,研究别人的恢复,自己去整理思路,这样才能进步 :)