编号 层次 日期
01 123 2009-10-01
01 124 2009-10-01
01 125 2009-10-01
01 126 2009-10-01
02 456 2009-10-01
02 457 2009-10-01
02 458 2009-10-01
03 789 2009-10-01
03 789 2009-10-0101 125 2009-10-02
01 126 2009-10-02
02 456 2009-10-02
02 457 2009-10-02
02 458 2009-10-02
03 789 2009-10-02
03 789 2009-10-02
数据就是这些 当然后面还有很多日期 查询的时候 同一种编号在同一天内如果有超过两个 层次 就只要前两个层次就好了
结果应该是这样的
编号 层次 日期
01 123 2009-10-01
01 124 2009-10-01
02 456 2009-10-01
02 457 2009-10-01
03 789 2009-10-01
03 789 2009-10-0101 125 2009-10-02
01 126 2009-10-02
02 456 2009-10-02
02 457 2009-10-02
03 789 2009-10-02
03 789 2009-10-02拜托了 非常着急 小弟在线等待~~
谢谢你们
01 123 2009-10-01
01 124 2009-10-01
01 125 2009-10-01
01 126 2009-10-01
02 456 2009-10-01
02 457 2009-10-01
02 458 2009-10-01
03 789 2009-10-01
03 789 2009-10-0101 125 2009-10-02
01 126 2009-10-02
02 456 2009-10-02
02 457 2009-10-02
02 458 2009-10-02
03 789 2009-10-02
03 789 2009-10-02
数据就是这些 当然后面还有很多日期 查询的时候 同一种编号在同一天内如果有超过两个 层次 就只要前两个层次就好了
结果应该是这样的
编号 层次 日期
01 123 2009-10-01
01 124 2009-10-01
02 456 2009-10-01
02 457 2009-10-01
03 789 2009-10-01
03 789 2009-10-0101 125 2009-10-02
01 126 2009-10-02
02 456 2009-10-02
02 457 2009-10-02
03 789 2009-10-02
03 789 2009-10-02拜托了 非常着急 小弟在线等待~~
谢谢你们
from (select rowid=row_number() over(partition by 日期,编号 order by 层次),*
from tb) as t
where rowid <=2
order by 日期,编号
-- Author : liangCK 梁爱兰
-- Comment: 小梁 爱 兰儿
-- Date : 2009-11-23 19:17:17
-------------------------------------
--> 生成测试数据: @tb
DECLARE @tb TABLE (编号 varchar(2),层次 int,日期 datetime)
INSERT INTO @tb
SELECT '01',123,'2009-10-01' UNION ALL
SELECT '01',124,'2009-10-01' UNION ALL
SELECT '01',125,'2009-10-01' UNION ALL
SELECT '01',126,'2009-10-01' UNION ALL
SELECT '02',456,'2009-10-01' UNION ALL
SELECT '02',457,'2009-10-01' UNION ALL
SELECT '02',458,'2009-10-01' UNION ALL
SELECT '03',789,'2009-10-01' UNION ALL
SELECT '03',789,'2009-10-01' UNION ALL
SELECT '01',125,'2009-10-02' UNION ALL
SELECT '01',126,'2009-10-02' UNION ALL
SELECT '02',456,'2009-10-02' UNION ALL
SELECT '02',457,'2009-10-02' UNION ALL
SELECT '02',458,'2009-10-02' UNION ALL
SELECT '03',789,'2009-10-02' UNION ALL
SELECT '03',789,'2009-10-02'--SQL查询如下:select 编号,层次,日期
from (select rowid=row_number() over(partition by 日期,编号 order by 层次),*
from @tb) as t
where rowid <=2
order by 日期,编号
/*
编号 层次 日期
---- ----------- -----------------------
01 123 2009-10-01 00:00:00.000
01 124 2009-10-01 00:00:00.000
02 456 2009-10-01 00:00:00.000
02 457 2009-10-01 00:00:00.000
03 789 2009-10-01 00:00:00.000
03 789 2009-10-01 00:00:00.000
01 125 2009-10-02 00:00:00.000
01 126 2009-10-02 00:00:00.000
02 456 2009-10-02 00:00:00.000
02 457 2009-10-02 00:00:00.000
03 789 2009-10-02 00:00:00.000
03 789 2009-10-02 00:00:00.000(12 行受影响)
*/
as(
select * ,row_number()over(partition by 编号,日期 order by 编号) as Tag
)select * from cte where Tag<3
-- Author : liangCK 梁爱兰
-- Comment: 小梁 爱 兰儿
-- Date : 2009-11-23 19:17:17
-------------------------------------
--> 生成测试数据: @tb
DECLARE @tb TABLE (编号 varchar(2),层次 int,日期 datetime)
INSERT INTO @tb
SELECT '01',123,'2009-10-01' UNION ALL
SELECT '01',124,'2009-10-01' UNION ALL
SELECT '01',125,'2009-10-01' UNION ALL
SELECT '01',126,'2009-10-01' UNION ALL
SELECT '02',456,'2009-10-01' UNION ALL
SELECT '02',457,'2009-10-01' UNION ALL
SELECT '02',458,'2009-10-01' UNION ALL
SELECT '03',789,'2009-10-01' UNION ALL
SELECT '03',789,'2009-10-01' UNION ALL
SELECT '01',125,'2009-10-02' UNION ALL
SELECT '01',126,'2009-10-02' UNION ALL
SELECT '02',456,'2009-10-02' UNION ALL
SELECT '02',457,'2009-10-02' UNION ALL
SELECT '02',458,'2009-10-02' UNION ALL
SELECT '03',789,'2009-10-02' UNION ALL
SELECT '03',789,'2009-10-02'--SQL查询如下:select 编号,层次,日期
from (select rowid=(SELECT COUNT(*) FROM @tb
WHERE 编号=a.编号 and 日期=a.日期 and 层次<= a.层次),*
from @tb as a) as t
where rowid <=2
order by 日期,编号
from (select rowid=row_number() over(partition by 日期,编号 order by 层次),* from tb) as t
where rowid <=2
order by 日期,编号
create table tb([编号] int,[层次] int,[日期] datetime)
insert into tb select '01','123','2009-10-01'
union all select '01','124','2009-10-01'
union all select '01','125','2009-10-01'
union all select '01','126','2009-10-01'
union all select '02','456','2009-10-01'
union all select '02','457','2009-10-01'
union all select '02','458','2009-10-01'
union all select '03','789','2009-10-01'
union all select '03','789','2009-10-01'
union all select '01','125','2009-10-02'
union all select '01','126','2009-10-02'
union all select '02','456','2009-10-02'
union all select '02','457','2009-10-02'
union all select '02','458','2009-10-02'
union all select '03','789','2009-10-02'
union all select '03','789','2009-10-02' select a.* from tb a where
(select count(1) from tb where a.编号=编号 and datediff(dd,日期,a.日期)=0 and 层次<a.层次)<2--编号 层次 日期
------------- ----------- -----------------------
--1 123 2009-10-01 00:00:00.000
--1 124 2009-10-01 00:00:00.000
--2 456 2009-10-01 00:00:00.000
--2 457 2009-10-01 00:00:00.000
--3 789 2009-10-01 00:00:00.000
--3 789 2009-10-01 00:00:00.000
--1 125 2009-10-02 00:00:00.000
--1 126 2009-10-02 00:00:00.000
--2 456 2009-10-02 00:00:00.000
--2 457 2009-10-02 00:00:00.000
--3 789 2009-10-02 00:00:00.000
--3 789 2009-10-02 00:00:00.000
--
--(12 行受影响)
--SQL2000DECLARE @tb TABLE (编号 varchar(2),层次 int,日期 datetime)
INSERT INTO @tb
SELECT '01',123,'2009-10-01' UNION ALL
SELECT '01',124,'2009-10-01' UNION ALL
SELECT '01',125,'2009-10-01' UNION ALL
SELECT '01',126,'2009-10-01' UNION ALL
SELECT '02',456,'2009-10-01' UNION ALL
SELECT '02',457,'2009-10-01' UNION ALL
SELECT '02',458,'2009-10-01' UNION ALL
SELECT '03',789,'2009-10-01' UNION ALL
SELECT '03',789,'2009-10-01' UNION ALL
SELECT '01',125,'2009-10-02' UNION ALL
SELECT '01',126,'2009-10-02' UNION ALL
SELECT '02',456,'2009-10-02' UNION ALL
SELECT '02',457,'2009-10-02' UNION ALL
SELECT '02',458,'2009-10-02' UNION ALL
SELECT '03',789,'2009-10-02' UNION ALL
SELECT '03',789,'2009-10-02'
SELECT *
FROM @TB a
WHERE (select count(*) from @tb where a.编号=编号 and a.日期=日期 and a.层次>=层次)<=2
ORDER BY 日期,编号/*
编号 层次 日期
---- ----------- ------------------------------------------------------
01 123 2009-10-01 00:00:00.000
01 124 2009-10-01 00:00:00.000
02 456 2009-10-01 00:00:00.000
02 457 2009-10-01 00:00:00.000
03 789 2009-10-01 00:00:00.000
03 789 2009-10-01 00:00:00.000
01 125 2009-10-02 00:00:00.000
01 126 2009-10-02 00:00:00.000
02 456 2009-10-02 00:00:00.000
02 457 2009-10-02 00:00:00.000
03 789 2009-10-02 00:00:00.000
03 789 2009-10-02 00:00:00.000(所影响的行数为 12 行)
--> 测试数据: @s
declare @s table (编号 varchar(2),层次 int,日期 datetime)
insert into @s
select '01',123,'2009-10-01' union all
select '01',124,'2009-10-01' union all
select '01',125,'2009-10-01' union all
select '01',126,'2009-10-01' union all
select '02',456,'2009-10-01' union all
select '02',457,'2009-10-01' union all
select '02',458,'2009-10-01' union all
select '03',789,'2009-10-01' union all
select '03',789,'2009-10-01' union all
select '01',125,'2009-10-02' union all
select '01',126,'2009-10-02' union all
select '02',456,'2009-10-02' union all
select '02',457,'2009-10-02' union all
select '02',458,'2009-10-02' union all
select '03',789,'2009-10-02' union all
select '03',789,'2009-10-02'select * from @s a
where (select count(*) from @s where 编号=a.编号 and 层次<a.层次 and datediff(dd,日期,a.日期)=0)<2--结果:
编号 层次 日期
---- ----------- -----------------------
01 123 2009-10-01 00:00:00.000
01 124 2009-10-01 00:00:00.000
02 456 2009-10-01 00:00:00.000
02 457 2009-10-01 00:00:00.000
03 789 2009-10-01 00:00:00.000
03 789 2009-10-01 00:00:00.000
01 125 2009-10-02 00:00:00.000
01 126 2009-10-02 00:00:00.000
02 456 2009-10-02 00:00:00.000
02 457 2009-10-02 00:00:00.000
03 789 2009-10-02 00:00:00.000
03 789 2009-10-02 00:00:00.000
-- 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)
*/