sql server给反复列加序列号
日期：2014-05-17 浏览次数：20695 次
sql server给重复列加序列号
CREATE TABLE [dbo].[test1]
(
[id] [bigint] IDENTITY(1,1) NOT NULL,
[Name] [nvarchar](50) NOT NULL
)
insert into test1(A)
insert into test1(A)
insert into test1(B)
insert into test1(C)
insert into test1(C)
insert into test1(C)
insert into test1(D)
insert into test1(A)
insert into test1(D)
insert into test1(B)
SELECT * FROM TEST1
id name
1 A
2 A
3 B
4 C
5 C
6 C
7 D
8 A
9 D
10 B
我想更新表得到如结果
1 A
2 A1
3 B
4 C
5 C1
6 C2
7 D
8 A2
9 D1
10 B1
求帮助
------解决方案--------------------
CREATE TABLE [dbo].[test1]
(
[id] [bigint] IDENTITY(1,1) NOT NULL,
[Name] [nvarchar](50) NOT NULL
)
insert into test1(A)
insert into test1(A)
insert into test1(B)
insert into test1(C)
insert into test1(C)
insert into test1(C)
insert into test1(D)
insert into test1(A)
insert into test1(D)
insert into test1(B)
SELECT * FROM TEST1
id name
1 A
2 A
3 B
4 C
5 C
6 C
7 D
8 A
9 D
10 B
我想更新表得到如结果
1 A
2 A1
3 B
4 C
5 C1
6 C2
7 D
8 A2
9 D1
10 B1
求帮助
------解决方案--------------------
- SQL code
UPDATE test1
SET NAME = NAME + CASE WHEN CONVERT(VARCHAR, N.no) ='0' THEN '' ELSE CONVERT(VARCHAR, N.no) END
FROM test1
INNER JOIN ( SELECT id ,
ROW_NUMBER() OVER ( PARTITION BY NAME ORDER BY GETDATE() )
- 1 AS no
FROM test1
) N ON test1.id = N.ID
SELECT * FROM test1
/*
id Name
1 A
2 A1
3 B1
4 C
5 C1
6 C2
7 D
8 A2
9 D1
10 B*/
------解决方案--------------------
declare @num int
update a set Name=name+case when @num=0 then '' else rtrim(@num) end,
@num=(select count(*) from test1 where name=a.name and id<a.id)
from test1 a
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