继续问一下

[liherun]

表TB1
name riqi jine
张三 2008-1-1 100
张三 2008-2-1 100
张三 2008-3-1 100
张三 2008-4-1 100
张三 2008-5-1 100
张三 2008-6-1 100
李四 2008-1-10 200
李四 2008-2-10 200
李四 2008-3-10 200
李四 2008-4-10 200


查询想要的结果

张三 2008-1-1 100 2008-2-1 100 2008-3-1 100 2008-4-1 100 2008-5-1 100 2008-6-1 100
李四 2008-1-10 200 2008-2-10 200 2008-3-10 200 2008-4-10 200

表中同一姓名的数据行不确定


11

declare @i int;
set @i = (select top 1 cnt
          from (select count(*) as cnt from tb group by name) as t
          order by cnt desc);

declare @sql varchar(max);
set @sql = '';

select @sql = @sql + ',max(case when rowid ='+rtrim(number)+' 
                       then convert(varchar(10),riqi,120) else '''' end)'
                   + ',max(case when rowid ='+rtrim(number)+' 
                       then rtrim(jine) else '''' end)'
from master.dbo.spt_values
where type = 'p' and number < @i;

exec('select name'+@sql+' 
    from (select *,rowid=row_number() over(partition by name order by riqi)-1
          from tb) as t
     group by name');

这个怎么限制只查询20列，也就是原表中同一姓名只查询10行？ 改下上面的SQL就行

[sgtzzc]

按某个字段排序取前10个，还是每行显示10个？

[liherun]

张三	2008-01-01 00:00:00	100
张三	2008-02-01 00:00:00	100
张三	2008-03-01 00:00:00	100
张三	2008-04-01 00:00:00	100
张三	2008-05-01 00:00:00	100
张三	2008-06-01 00:00:00	100
李四	2008-01-10 00:00:00	200
李四	2008-02-10 00:00:00	200
李四	2008-03-10 00:00:00	200
李四	2008-04-10 00:00:00	200
张三	NULL	NULL
张三	NULL	NULL
张三	NULL	NULL
张三	NULL	NULL
张三	NULL	NULL

这里面张三有11行 ，转换完了有23列，
我想要的结果是 只查10行，转换完了有21列

[SQL77]

分组取前N行

SELECT * FROM TB T WHERE ID IN(SLECT TOP 10 ID FROM TB WHERE T.NAME=NAME)

[--小F--]

分组取前10 还是直接取前10？

[qqqwwwqw]

用top 试下看

[qqqwwwqw]

分组取前10吧

[--小F--]

---------------------------------
--  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)
*/

[liherun]

改下小梁哥写的那个SQL语句吧

[SQL77]

exec('select name'+@sql+' 
    from (select *,rowid=row_number() over(partition by name order by riqi)-1
          from tb) as t WHERE RIQI IN(SELECT TOP 10 RIQI FROM ((select *,rowid=row_number() over(partition by name order by riqi)-1
          from tb)AS T1 WHERE T.NAME=T1.NAME)
     group by name');

[liherun]

分组取前10，我不知道那个TOP 10写什么地方啊？麻烦改下这个语句，表我题目里有

declare @i int;
set @i = (select top 1 cnt
          from (select count(*) as cnt from tb group by name) as t
          order by cnt desc);

declare @sql varchar(max);
set @sql = '';

select @sql = @sql + ',max(case when rowid ='+rtrim(number)+' 
                       then convert(varchar(10),riqi,120) else '''' end)'
                   + ',max(case when rowid ='+rtrim(number)+' 
                       then rtrim(jine) else '''' end)'
from master.dbo.spt_values
where type = 'p' and number < @i;

exec('select name'+@sql+' 
    from (select *,rowid=row_number() over(partition by name order by riqi)-1
          from tb) as t
     group by name');

[SQL77]

exec('select name'+@sql+' 
    from (select *,rowid=row_number() over(partition by name order by riqi)-1
          from tb) as t WHERE RIQI IN(SELECT TOP 10 RIQI FROM (select *,rowid=row_number() over(partition by name order by riqi)-1
          from tb)AS T1 WHERE T.NAME=T1.NAME)
     group by name');

上面多个了括号

[--小F--]

exec(
'select 
   name'+@sql+' 
 from 
    (select *,rowid=row_number() over(partition by name order by riqi)-1 from tb) as t 
 WHERE 
     RIQI 
 IN
     (SELECT TOP 10 RIQI FROM (select *,rowid=row_number() over(partition by name order by riqi)-1 from tb) AS T1 
  WHERE 
      T.NAME=T1.NAME)
  group by 
      name');

[liherun]

sql77
还是23列啊，没有限制住

[SQL77]

[Quote=引用 13 楼 liherun 的回复:]
sql77
还是23列啊，没有限制住
[/Quote]
这样全控制了呀,每个姓名只能10条

[liherun]

李四	2008-01-10	200	2008-02-10	200	2008-03-10	200	2008-04-10	200														
张三											2008-01-01	100	2008-02-01	100	2008-03-01	100	2008-04-01	100	2008-05-01	100	2008-06-01	100

还是23列

[SQL77]

[Quote=引用 15 楼 liherun 的回复:]
SQL code李四2008-01-102002008-02-102002008-03-102002008-04-10200
张三2008-01-011002008-02-011002008-03-011002008-04-011002008-05-011002008-06-01100
还是23列
[/Quote]
没弄懂什么意思

[liherun]

看不出来效果，张三还是11条，

declare @i int;
set @i = (select top 1 cnt
          from (select top 10 count(*) as cnt from tb group by name) as t
          order by cnt desc);

declare @sql varchar(max);
set @sql = '';

select @sql = @sql + ',max(case when rowid ='+rtrim(number)+' 
                       then convert(varchar(10),riqi,120) else '''' end)'
                   + ',max(case when rowid ='+rtrim(number)+' 
                       then rtrim(jine) else '''' end)'
from master.dbo.spt_values
where type = 'p' and number < @i;
exec('select name'+@sql+' 
    from (select *,rowid=row_number() over(partition by name order by riqi)-1
          from tb) as t WHERE RIQI IN(SELECT TOP 10 RIQI FROM (select *,rowid=row_number() over(partition by name order by riqi)-1
          from tb)AS T1 WHERE T.NAME=T1.NAME)
     group by name');

exec('select name'+@sql+' 
    from (select * ,rowid=row_number() over(partition by name order by riqi)-1
          from tb) as t
     group by name');

你执行下看看结果就知道了

[gaoge11]

SQL77 你上贴写的 是按月份区分的 我要取的是前20行怎么办

[liherun]

就是把@i的值给写死就行了，不需要定义@i的值，谢谢大家，表达能力十分欠缺，不好意思 结贴