SQL求租

[nlpz]

---ta
C1 C2
1 aa
2 aa
3 aa
4 bb
5 bb
------要求结果
C1 C2 C3
1 aa 1
2 aa 2
3 aa 3
4 bb 1
5 bb 2

[chenguang79]

CREATE TABLE tt(
   id int,
   c2 varchar(10)
)



INSERT INTO tt
SELECT 1,'aa'  UNION ALL 
SELECT 2,'aa' UNION ALL 
SELECT 3,'aa' UNION ALL 
SELECT 4,'bb' UNION ALL 
SELECT 5,'bb' 


SELECT *,ROW_NUMBER() OVER(partition by c2 ORDER BY id) AS c3 FROM tt

[nlpz]

IF OBJECT_ID('[ta]') IS NOT NULL
DROP TABLE [ta]
GO
CREATE TABLE [ta] ([c1] [int],[c2] [nvarchar](10))
INSERT INTO [ta]
SELECT '1','aa' UNION ALL
SELECT '2','aa' UNION ALL
SELECT '3','aa' UNION ALL
SELECT '4','bb' UNION ALL
SELECT '5','bb'

[王向飞]

select *,ROW_NUMBER()OVER (PARTITION BY [c2] ORDER BY [c2]) AS C3
 from ta

[--小F--]

2000的
----------------------------------------------------------------
-- Author  :fredrickhu(小F，向高手学习)
-- Date    :2010-11-11 12:10:40
-- Version:
--      Microsoft SQL Server 2005 - 9.00.4035.00 (Intel X86) 
--	Nov 24 2008 13:01:59 
--	Copyright (c) 1988-2005 Microsoft Corporation
--	Developer Edition on Windows NT 5.1 (Build 2600: Service Pack 3)
--
----------------------------------------------------------------
--> 测试数据：[tb]
if object_id('[tb]') is not null drop table [tb]
go 
create table [tb]([C1] int,[C2] varchar(2))
insert [tb]
select 1,'aa' union all
select 2,'aa' union all
select 3,'aa' union all
select 4,'bb' union all
select 5,'bb'
--------------开始查询--------------------------
---2000
select
   *,c3=(select count(c2)+1 from tb where c2=t.c2 and c1<t.c1)
from
  tb t

---2005
select
   *,c3=row_number()over(partition by c2 order by c1)
from
  tb
----------------结果----------------------------
/* C1          C2   c3
----------- ---- -----------
1           aa   1
2           aa   2
3           aa   3
4           bb   1
5           bb   2

(5 行受影响)
*/

[-晴天]

create table [tb]([C1] int,[C2] varchar(2))
insert [tb]
select 1,'aa' union all
select 2,'aa' union all
select 3,'aa' union all
select 4,'bb' union all
select 5,'bb'
go
select c1,c2,c1-(select min(c1) from tb where c2=a.c2)+1 as c3 from tb a
go
drop table tb
/*
c1          c2   c3
----------- ---- -----------
1           aa   1
2           aa   2
3           aa   3
4           bb   1
5           bb   2

(5 行受影响)
*/

[fpzgm]

--> 测试数据：[tb]
if object_id('[tb]') is not null drop table [tb]
go 
create table [tb]([C1] int,[C2] varchar(2))
insert [tb]
select 1,'aa' union all
select 2,'aa' union all
select 3,'aa' union all
select 4,'bb' union all
select 5,'bb'

---2000
select
   *,c3=(select count(c2)+1 from tb where c2=t.c2 and c1<t.c1)
from
  tb t

---2005,2008
select
   *,c3=row_number()over(partition by c2 order by c1)
from
  tb
/* C1          C2   c3
----------- ---- -----------
1           aa   1
2           aa   2
3           aa   3
4           bb   1
5           bb   2

(5 行受影响)
*/