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create table tb(Name varchar(20),MobilePhone varchar(20),position varchar(20),LoveSports varchar(20),Venues varchar(20))
insert into tb values('aa' , '1234567' , '球场' , '羽毛球,篮球' , 'YS001')
insert into tb values('bb' , '1234567' , '游泳馆', '游泳' , '81204')
insert into tb values('cc' , '7654321' , '冰场' , '滑冰' , '95623')
insert into tb values('aa' , '1234567' , '球场' , '足球' , 'B12125')
insert into tb values('aa' , '1234567' , '球场' , '羽毛球' , 'Y12121')
insert into tb values('cc' , '7654321' , '球场' , '羽毛球,篮球' , 'YS121')
go
-- 查询处理
SELECT *
FROM(
SELECT DISTINCT
Name,MobilePhone,position
FROM tb
)A
OUTER APPLY(
SELECT
[LoveSports]= STUFF(REPLACE(REPLACE(
(
SELECT LoveSports FROM tb N
WHERE name = A.name
FOR XML AUTO
), '<N LoveSports="', ','), '"/>', ''), 1, 1, '')
)N
drop table tb
/*
Name MobilePhone Place LoveSports
---------- ----------- ---------- ----------------------------------------------------------------------------------------------------
aa 1234567 球场 羽毛球,篮球,足球
bb 1234567 游泳馆 游泳
cc 7654321 冰场 滑冰
cc 7654321 球场 羽毛球,篮球
*/
create table tb(Name varchar(20),MobilePhone varchar(20),position varchar(20),LoveSports varchar(20),Venues varchar(20))
insert into tb values('aa' , '1234567' , '球场' , '羽毛球,篮球' , 'YS001')
insert into tb values('bb' , '1234567' , '游泳馆', '游泳' , '81204')
insert into tb values('cc' , '7654321' , '冰场' , '滑冰' , '95623')
insert into tb values('aa' , '1234567' , '球场' , '足球' , 'B12125')
insert into tb values('aa' , '1234567' , '球场' , '羽毛球' , 'Y12121')
insert into tb values('cc' , '7654321' , '球场' , '羽毛球,篮球' , 'YS121')
go
-- 查询处理
SELECT *
FROM(
SELECT DISTINCT
Name
FROM tb
)A
OUTER APPLY(
SELECT
[LoveSports]= STUFF(REPLACE(REPLACE(
(
SELECT LoveSports FROM tb N
WHERE name = A.name
FOR XML AUTO
), '<N LoveSports="', ','), '"/>', ''), 1, 1, '')
)N
drop table tb
/*
Name MobilePhone Place LoveSports
---------- ----------- ---------- ----------------------------------------------------------------------------------------------------
aa 1234567 球场 羽毛球,篮球,足球
bb 1234567 游泳馆 游泳
cc 7654321 冰场 滑冰
cc 7654321 球场 羽毛球,篮球
*/
*/
create table tb(Name varchar(20),MobilePhone varchar(20),position varchar(20),LoveSports varchar(20),Venues varchar(20))
insert into tb values('aa' , '1234567' , '球场' , '羽毛球,篮球' , 'YS001')
insert into tb values('bb' , '1234567' , '游泳馆', '游泳' , '81204')
insert into tb values('cc' , '7654321' , '冰场' , '滑冰' , '95623')
insert into tb values('aa' , '1234567' , '球场' , '足球' , 'B12125')
insert into tb values('aa' , '1234567' , '球场' , '羽毛球' , 'Y12121')
insert into tb values('cc' , '7654321' , '球场' , '羽毛球,篮球' , 'YS121')
go
-- 查询处理
SELECT *
FROM(
SELECT DISTINCT
Name,MobilePhone,max(position) as position
FROM tb group by name,MobilePhone
)A
OUTER APPLY(
SELECT
[LoveSports]= STUFF(REPLACE(REPLACE(
(
SELECT LoveSports FROM tb N
WHERE name = A.name
FOR XML AUTO
), '<N LoveSports="', ','), '"/>', ''), 1, 1, '')
)N
drop table tb
/*
Name MobilePhone Place LoveSports
---------- ----------- ---------- ----------------------------------------------------------------------------------------------------
aa 1234567 球场 羽毛球,篮球,足球
bb 1234567 游泳馆 游泳
cc 7654321 球场 羽毛球,篮球
*/
WAVID ELIASON 13585740767 松江游泳馆 NULL
WAVID ELIASON 137658421 松江游泳馆 NULL
阿尔卡特 13764549386 球场 NULL
阿尔卡特 13816976878 源深 NULL
白波 13911605700 上海游泳馆 NULL
白波 13916605700 万体冰场 NULL
白友为 13166401040 上海游泳馆 NULL
白云 13679242435 源深 NULL
白云 13918453325 爱动卡 NULL
鲍铁军 13901696099 上海游泳馆 NULL
鲍伟 13818790593 源深 NULL
鲍伟 13916803850 isports NULL
贝美根 13651931890 万体冰场 NULL
贝美根 13651937890 万体冰场 NULL
毕燕飞 13571760388 上海游泳馆 NULL
毕燕飞 13671760388 上海游泳馆 NULL
卞广泓 13601832825 上海游泳馆 NULL
陈伟 13817848967 松江游泳馆 游泳,游泳,游泳,篮球,羽毛球,篮球,羽毛球,篮球,羽毛球,足球,篮球,足球,篮球,足球,篮球,足球,篮球,足球,篮球,羽毛球,篮球,游泳,游泳,游泳
陈伟 13901650425 上海游泳馆 游泳,游泳,游泳,篮球,羽毛球,篮球,羽毛球,篮球,羽毛球,足球,篮球,足球,篮球,足球,篮球,足球,篮球,足球,篮球,羽毛球,篮球,游泳,游泳,游泳
陈伟 13917283833 源深 游泳,游泳,游泳,篮球,羽毛球,篮球,羽毛球,篮球,羽毛球,足球,篮球,足球,篮球,足球,篮球,足球,篮球,足球,篮球,羽毛球,篮球,游泳,游泳,游泳
陈伟 13918766440 源深 游泳,游泳,游泳,篮球,羽毛球,篮球,羽毛球,篮球,羽毛球,足球,篮球,足球,篮球,足球,篮球,足球,篮球,足球,篮球,羽毛球,篮球,游泳,游泳,游泳
陈伟 15800331609 球场 游泳,游泳,游泳,篮球,羽毛球,篮球,羽毛球,篮球,羽毛球,足球,篮球,足球,篮球,足球,篮球,足球,篮球,足球,篮球,羽毛球,篮球,游泳,游泳,游泳
陈伟 51702701 上海游泳馆 游泳,游泳,游泳,篮球,羽毛球,篮球,羽毛球,篮球,羽毛球,足球,篮球,足球,篮球,足球,篮球,足球,篮球,足球,篮球,羽毛球,篮球,游泳,游泳,游泳
陈伟明 13901845998 上海游泳馆 游泳,游泳
陈伟明 13901845998/64872589 上海游泳馆 游泳,游泳
陈玮 13364232533 松江游泳馆 游泳,篮球,羽毛球,篮球,羽毛球,羽毛球,篮球,游泳,游泳,游泳
陈玮 13501813882 上海游泳馆 游泳,篮球,羽毛球,篮球,羽毛球,羽毛球,篮球,游泳,游泳,游泳
陈玮 13564232533 松江游泳馆 游泳,篮球,羽毛球,篮球,羽毛球,羽毛球,篮球,游泳,游泳,游泳
陈玮 13817236067 上海游泳馆 游泳,篮球,羽毛球,篮球,羽毛球,羽毛球,篮球,游泳,游泳,游泳
陈玮 1390198249 源深 游泳,篮球,羽毛球,篮球,羽毛球,羽毛球,篮球,游泳,游泳,游泳
陈玮 13916011333 源深 游泳,篮球,羽毛球,篮球,羽毛球,羽毛球,篮球,游泳,游泳,游泳
韩霞令 13361927237 isports 滑冰,篮球,足球,羽毛球,游泳,滑冰,篮球,足球,羽毛球,游泳
张杰 13361929360 源深 篮球,羽毛球,篮球,羽毛球,篮球,羽毛球<N/>,羽毛球,篮球,羽毛球,篮球,游泳,滑冰,滑冰,篮球,足球,羽毛球,游泳,滑冰,篮球,足球,羽毛球,游泳
王斐 13361935010 球场 足球,篮球,羽毛球,篮球
王晨 13361952265 球场 篮球,羽毛球,篮球,羽毛球,篮球,羽毛球,羽毛球,篮球
李家明 13361967596 isports 篮球,羽毛球,滑冰,篮球,足球,羽毛球,游泳
王飞 13361973289 球场 篮球,羽毛球,羽毛球,篮球,游泳
王威 13361990590 球场 足球,篮球,羽毛球,篮球
张志铭 13361992716 源深 篮球,羽毛球,滑冰,篮球,足球,羽毛球,游泳
create table test(Name varchar(10),MobilePhone varchar(10),Place varchar(10),LoveSports varchar(40),Venues varchar(10))
insert into test select 'aa','1234567','球场' ,'羽毛球,篮球','YS001 '
insert into test select 'bb','1234567','游泳馆','游泳' ,'81204 '
insert into test select 'cc','7654321','冰场' ,'滑冰' ,'95623 '
insert into test select 'aa','1234567','球场' ,'足球' ,'B12125'
insert into test select 'aa','1234567','球场' ,'羽毛球' ,'Y12121'
insert into test select 'cc','7654321','球场' ,'羽毛球,篮球','YS121 '
go
create function f_str(@Name varchar(10),@MobilePhone varchar(10),@Place varchar(10))
returns varchar(100)
as
begin
declare @ret varchar(8000),@LSs varchar(40)
declare tc cursor for
select distinct LoveSports from test where Name=@Name and MobilePhone=@MobilePhone and Place=@Place
open tc
fetch next from tc into @ret
fetch next from tc into @LSs
while @@fetch_status=0
begin
set @LSs=@LSs+','
while charindex(',',@LSs)>0
begin
select
@ret=@ret+case when charindex(','+left(@LSs,charindex(',',@LSs)), ','+@ret+',')>0
then '' else ','+left(@LSs,charindex(',',@LSs)-1) end,
@LSs=stuff(@LSs,1,charindex(',',@LSs),'')
end
fetch next from tc into @LSs
end
return @ret
end
go
select Name,MobilePhone,Place,dbo.f_str(Name,MobilePhone,Place) as LoveSports from test group by Name,MobilePhone,Place
/*
Name MobilePhone Place LoveSports
---------- ----------- ---------- ----------------------------------------------------------------------------------------------------
aa 1234567 球场 羽毛球,篮球,足球
bb 1234567 游泳馆 游泳
cc 7654321 冰场 滑冰
cc 7654321 球场 羽毛球,篮球
*/
go
drop function f_str
drop table test
go
--处理表重复记录(查询和删除)
/******************************************************************************************************************************************************
1、Num、Name相同的重复值记录,没有大小关系只保留一条
2、Name相同,ID有大小关系时,保留大或小其中一个记录
整理人:中国风(Roy)
日期:2008.06.06
******************************************************************************************************************************************************/
--1、用于查询重复处理记录(如果列没有大小关系时2000用生成自增列和临时表处理,SQL2005用row_number函数处理)
--> --> (Roy)生成測試數據
if not object_id('Tempdb..#T') is null
drop table #T
Go
Create table #T([ID] int,[Name] nvarchar(1),[Memo] nvarchar(2))
Insert #T
select 1,N'A',N'A1' union all
select 2,N'A',N'A2' union all
select 3,N'A',N'A3' union all
select 4,N'B',N'B1' union all
select 5,N'B',N'B2'
Go
--I、Name相同ID最小的记录(推荐用1,2,3),方法3在SQl05时,效率高于1、2
方法1:
Select * from #T a where not exists(select 1 from #T where Name=a.Name and ID<a.ID)
方法2:
select a.* from #T a join (select min(ID)ID,Name from #T group by Name) b on a.Name=b.Name and a.ID=b.ID
方法3:
select * from #T a where ID=(select min(ID) from #T where Name=a.Name)
方法4:
select a.* from #T a join #T b on a.Name=b.Name and a.ID>=b.ID group by a.ID,a.Name,a.Memo having count(1)=1
方法5:
select * from #T a group by ID,Name,Memo having ID=(select min(ID)from #T where Name=a.Name)
方法6:
select * from #T a where (select count(1) from #T where Name=a.Name and ID<a.ID)=0
方法7:
select * from #T a where ID=(select top 1 ID from #T where Name=a.name order by ID)
方法8:
select * from #T a where ID!>all(select ID from #T where Name=a.Name)
方法9(注:ID为唯一时可用):
select * from #T a where ID in(select min(ID) from #T group by Name)
--SQL2005:
方法10:
select ID,Name,Memo from (select *,min(ID)over(partition by Name) as MinID from #T a)T where ID=MinID
方法11:
select ID,Name,Memo from (select *,row_number()over(partition by Name order by ID) as MinID from #T a)T where MinID=1
生成结果:
/*
ID Name Memo
----------- ---- ----
1 A A1
4 B B1
(2 行受影响)
*/
--II、Name相同ID最大的记录,与min相反:
方法1:
Select * from #T a where not exists(select 1 from #T where Name=a.Name and ID>a.ID)
方法2:
select a.* from #T a join (select max(ID)ID,Name from #T group by Name) b on a.Name=b.Name and a.ID=b.ID order by ID
方法3:
select * from #T a where ID=(select max(ID) from #T where Name=a.Name) order by ID
方法4:
select a.* from #T a join #T b on a.Name=b.Name and a.ID<=b.ID group by a.ID,a.Name,a.Memo having count(1)=1
方法5:
select * from #T a group by ID,Name,Memo having ID=(select max(ID)from #T where Name=a.Name)
方法6:
select * from #T a where (select count(1) from #T where Name=a.Name and ID>a.ID)=0
方法7:
select * from #T a where ID=(select top 1 ID from #T where Name=a.name order by ID desc)
方法8:
select * from #T a where ID!<all(select ID from #T where Name=a.Name)
方法9(注:ID为唯一时可用):
select * from #T a where ID in(select max(ID) from #T group by Name)
--SQL2005:
方法10:
select ID,Name,Memo from (select *,max(ID)over(partition by Name) as MinID from #T a)T where ID=MinID
方法11:
select ID,Name,Memo from (select *,row_number()over(partition by Name order by ID desc) as MinID from #T a)T where MinID=1
生成结果2:
/*
ID Name Memo
----------- ---- ----
3 A A3
5 B B2
(2 行受影响)
*/
--2、删除重复记录有大小关系时,保留大或小其中一个记录
--> --> (Roy)生成測試數據
if not object_id('Tempdb..#T') is null
drop table #T
Go
Create table #T([ID] int,[Name] nvarchar(1),[Memo] nvarchar(2))
Insert #T
select 1,N'A',N'A1' union all
select 2,N'A',N'A2' union all
select 3,N'A',N'A3' union all
select 4,N'B',N'B1' union all
select 5,N'B',N'B2'
Go
--I、Name相同ID最小的记录(推荐用1,2,3),保留最小一条
方法1:
delete a from #T a where exists(select 1 from #T where Name=a.Name and ID<a.ID)
方法2:
delete a from #T a left join (select min(ID)ID,Name from #T group by Name) b on a.Name=b.Name and a.ID=b.ID where b.Id is null
方法3:
delete a from #T a where ID not in (select min(ID) from #T where Name=a.Name)
方法4(注:ID为唯一时可用):
delete a from #T a where ID not in(select min(ID)from #T group by Name)
方法5:
delete a from #T a where (select count(1) from #T where Name=a.Name and ID<a.ID)>0
方法6:
delete a from #T a where ID<>(select top 1 ID from #T where Name=a.name order by ID)
方法7:
delete a from #T a where ID>any(select ID from #T where Name=a.Name)
select * from #T
生成结果:
/*
ID Name Memo
----------- ---- ----
1 A A1
4 B B1
(2 行受影响)
*/
--II、Name相同ID保留最大的一条记录:
方法1:
delete a from #T a where exists(select 1 from #T where Name=a.Name and ID>a.ID)
方法2:
delete a from #T a left join (select max(ID)ID,Name from #T group by Name) b on a.Name=b.Name and a.ID=b.ID where b.Id is null
方法3:
delete a from #T a where ID not in (select max(ID) from #T where Name=a.Name)
方法4(注:ID为唯一时可用):
delete a from #T a where ID not in(select max(ID)from #T group by Name)
方法5:
delete a from #T a where (select count(1) from #T where Name=a.Name and ID>a.ID)>0
方法6:
delete a from #T a where ID<>(select top 1 ID from #T where Name=a.name order by ID desc)
方法7:
delete a from #T a where ID<any(select ID from #T where Name=a.Name)
select * from #T
/*
ID Name Memo
----------- ---- ----
3 A A3
5 B B2
(2 行受影响)
*/
--3、删除重复记录没有大小关系时,处理重复值
--> --> (Roy)生成測試數據
if not object_id('Tempdb..#T') is null
drop table #T
Go
Create table #T([Num] int,[Name] nvarchar(1))
Insert #T
select 1,N'A' union all
select 1,N'A' union all
select 1,N'A' union all
select 2,N'B' union all
select 2,N'B'
Go
方法1:
if object_id('Tempdb..#') is not null
drop table #
Select distinct * into # from #T--排除重复记录结果集生成临时表#
truncate table #T--清空表
insert #T select * from # --把临时表#插入到表#T中
--查看结果
select * from #T
/*
Num Name
----------- ----
1 A
2 B
(2 行受影响)
*/
--重新执行测试数据后用方法2
方法2:
alter table #T add ID int identity--新增标识列
go
delete a from #T a where exists(select 1 from #T where Num=a.Num and Name=a.Name and ID>a.ID)--只保留一条记录
go
alter table #T drop column ID--删除标识列
--查看结果
select * from #T
/*
Num Name
----------- ----
1 A
2 B
(2 行受影响)
*/
--重新执行测试数据后用方法3
方法3:
declare Roy_Cursor cursor local for
select count(1)-1,Num,Name from #T group by Num,Name having count(1)>1
declare @con int,@Num int,@Name nvarchar(1)
open Roy_Cursor
fetch next from Roy_Cursor into @con,@Num,@Name
while @@Fetch_status=0
begin
set rowcount @con;
delete #T where Num=@Num and Name=@Name
set rowcount 0;
fetch next from Roy_Cursor into @con,@Num,@Name
end
close Roy_Cursor
deallocate Roy_Cursor
--查看结果
select * from #T
/*
Num Name
----------- ----
1 A
2 B
(2 行受影响)
*/
create table tb(Name varchar(20),MobilePhone varchar(20),position varchar(20),LoveSports varchar(20),Venues varchar(20))
insert into tb values('aa' , '1234567' , '球场' , '羽毛球,篮球' , 'YS001')
insert into tb values('bb' , '1234567' , '游泳馆', '游泳' , '81204')
insert into tb values('cc' , '7654321' , '冰场' , '滑冰' , '95623')
insert into tb values('aa' , '1234567' , '球场' , '足球' , 'B12125')
insert into tb values('aa' , '1234567' , '球场' , '羽毛球' , 'Y12121')
insert into tb values('cc' , '7654321' , '球场' , '羽毛球,篮球' , 'YS121')
go
create function dbo.f_str(@Name varchar(20),@MobilePhone varchar(20)) returns varchar(100)
as
begin
declare @str varchar(1000)
set @str = ''
select @str = @str + ',' + cast(LoveSports as varchar) from tb where name = @name and MobilePhone = @MobilePhone
set @str = right(@str , len(@str) - 1)
return @str
end
go
--调用函数
select name,MobilePhone ,min(position) position, LoveSports = dbo.f_str(name,MobilePhone) , min(Venues) Venues from tb group by name,MobilePhone
drop function dbo.f_str
drop table tb
/*
name MobilePhone position LoveSports Venues
-------------------- -------------------- -------------------- ---------------------------------------------------------------------------------------------------- --------------------
aa 1234567 球场 羽毛球,篮球,足球,羽毛球 B12125
bb 1234567 游泳馆 游泳 81204
cc 7654321 冰场 滑冰,羽毛球,篮球 95623
(所影响的行数为 3 行)
*/
SQL code问题描述:
无论是在sql 2000,还是在 sql 2005 中,都没有提供字符串的聚合函数,
所以,当我们在处理下列要求时,会比较麻烦:
有表tb, 如下:
id value
----- ------
1 aa
1 bb
2 aaa
2 bbb
2 ccc
需要得到结果:
id values
------ -----------
1 aa,bb
2 aaa,bbb,ccc
即, group by id, 求 value 的和(字符串相加)
1. 旧的解决方法
-- 1. 创建处理函数
CREATE FUNCTION dbo.f_str(@id int)
RETURNS varchar(8000)
AS
BEGIN
DECLARE @r varchar(8000)
SET @r = ''
SELECT @r = @r + ',' + value
FROM tb
WHERE id=@id
RETURN STUFF(@r, 1, 1, '')
END
GO
-- 调用函数
SELECt id, values=dbo.f_str(id)
FROM tb
GROUP BY id
-- 2. 新的解决方法
-- 示例数据
DECLARE @t TABLE(id int, value varchar(10))
INSERT @t SELECT 1, 'aa'
UNION ALL SELECT 1, 'bb'
UNION ALL SELECT 2, 'aaa'
UNION ALL SELECT 2, 'bbb'
UNION ALL SELECT 2, 'ccc'
-- 查询处理
SELECT *
FROM(
SELECT DISTINCT
id
FROM @t
)A
OUTER APPLY(
SELECT
[values]= STUFF(REPLACE(REPLACE(
(
SELECT value FROM @t N
WHERE id = A.id
FOR XML AUTO
), '<N value="', ','), '"/>', ''), 1, 1, '')
)N
/*--结果
id values
----------- ----------------
1 aa,bb
2 aaa,bbb,ccc
(2 行受影响)
--*/
--各种字符串分函数
--3.3.1 使用游标法进行字符串合并处理的示例。
--处理的数据
CREATE TABLE tb(col1 varchar(10),col2 int)
INSERT tb SELECT 'a',1
UNION ALL SELECT 'a',2
UNION ALL SELECT 'b',1
UNION ALL SELECT 'b',2
UNION ALL SELECT 'b',3
--合并处理
--定义结果集表变量
DECLARE @t TABLE(col1 varchar(10),col2 varchar(100))
--定义游标并进行合并处理
DECLARE tb CURSOR LOCAL
FOR
SELECT col1,col2 FROM tb ORDER BY col1,col2
DECLARE @col1_old varchar(10),@col1 varchar(10),@col2 int,@s varchar(100)
OPEN tb
FETCH tb INTO @col1,@col2
SELECT @col1_old=@col1,@s=''
WHILE @@FETCH_STATUS=0
BEGIN
IF @col1=@col1_old
SELECT @s=@s+','+CAST(@col2 as varchar)
ELSE
BEGIN
INSERT @t VALUES(@col1_old,STUFF(@s,1,1,''))
SELECT @s=','+CAST(@col2 as varchar),@col1_old=@col1
END
FETCH tb INTO @col1,@col2
END
INSERT @t VALUES(@col1_old,STUFF(@s,1,1,''))
CLOSE tb
DEALLOCATE tb
--显示结果并删除测试数据
SELECT * FROM @t
DROP TABLE tb
/*--结果
col1 col2
---------- -----------
a 1,2
b 1,2,3
--*/
GO
/*==============================================*/
--3.3.2 使用用户定义函数,配合SELECT处理完成字符串合并处理的示例
--处理的数据
CREATE TABLE tb(col1 varchar(10),col2 int)
INSERT tb SELECT 'a',1
UNION ALL SELECT 'a',2
UNION ALL SELECT 'b',1
UNION ALL SELECT 'b',2
UNION ALL SELECT 'b',3
GO
--合并处理函数
CREATE FUNCTION dbo.f_str(@col1 varchar(10))
RETURNS varchar(100)
AS
BEGIN
DECLARE @re varchar(100)
SET @re=''
SELECT @re=@re+','+CAST(col2 as varchar)
FROM tb
WHERE col1=@col1
RETURN(STUFF(@re,1,1,''))
END
GO
--调用函数
SELECT col1,col2=dbo.f_str(col1) FROM tb GROUP BY col1
--删除测试
DROP TABLE tb
DROP FUNCTION f_str
/*--结果
col1 col2
---------- -----------
a 1,2
b 1,2,3
--*/
GO
/*==============================================*/
--3.3.3 使用临时表实现字符串合并处理的示例
--处理的数据
CREATE TABLE tb(col1 varchar(10),col2 int)
INSERT tb SELECT 'a',1
UNION ALL SELECT 'a',2
UNION ALL SELECT 'b',1
UNION ALL SELECT 'b',2
UNION ALL SELECT 'b',3
--合并处理
SELECT col1,col2=CAST(col2 as varchar(100))
INTO #t FROM tb
ORDER BY col1,col2
DECLARE @col1 varchar(10),@col2 varchar(100)
UPDATE #t SET
@col2=CASE WHEN @col1=col1 THEN @col2+','+col2 ELSE col2 END,
@col1=col1,
col2=@col2
SELECT * FROM #t
/*--更新处理后的临时表
col1 col2
---------- -------------
a 1
a 1,2
b 1
b 1,2
b 1,2,3
--*/
--得到最终结果
SELECT col1,col2=MAX(col2) FROM #t GROUP BY col1
/*--结果
col1 col2
---------- -----------
a 1,2
b 1,2,3
--*/
--删除测试
DROP TABLE tb,#t
GO
/*==============================================*/
--3.3.4.1 每组 <=2 条记录的合并
--处理的数据
CREATE TABLE tb(col1 varchar(10),col2 int)
INSERT tb SELECT 'a',1
UNION ALL SELECT 'a',2
UNION ALL SELECT 'b',1
UNION ALL SELECT 'b',2
UNION ALL SELECT 'c',3
--合并处理
SELECT col1,
col2=CAST(MIN(col2) as varchar)
+CASE
WHEN COUNT(*)=1 THEN ''
ELSE ','+CAST(MAX(col2) as varchar)
END
FROM tb
GROUP BY col1
DROP TABLE tb
/*--结果
col1 col2
---------- ----------
a 1,2
b 1,2
c 3
--*/
--3.3.4.2 每组 <=3 条记录的合并
--处理的数据
CREATE TABLE tb(col1 varchar(10),col2 int)
INSERT tb SELECT 'a',1
UNION ALL SELECT 'a',2
UNION ALL SELECT 'b',1
UNION ALL SELECT 'b',2
UNION ALL SELECT 'b',3
UNION ALL SELECT 'c',3
--合并处理
SELECT col1,
col2=CAST(MIN(col2) as varchar)
+CASE
WHEN COUNT(*)=3 THEN ','
+CAST((SELECT col2 FROM tb WHERE col1=a.col1 AND col2 NOT IN(MAX(a.col2),MIN(a.col2))) as varchar)
ELSE ''
END
+CASE
WHEN COUNT(*)>=2 THEN ','+CAST(MAX(col2) as varchar)
ELSE ''
END
FROM tb a
GROUP BY col1
DROP TABLE tb
/*--结果
col1 col2
---------- ------------
a 1,2
b 1,2,3
c 3
--*/
GO
if not object_id('A') is null
drop table A
Go
Create table A([id] int,[cname] nvarchar(2))
Insert A
select 1,N'张三' union all
select 2,N'李四' union all
select 3,N'王五' union all
select 4,N'蔡六'
Go
--> -->
if not object_id('B') is null
drop table B
Go
Create table B([id] int,[cname] nvarchar(5))
Insert B
select 1,N'1,2,3' union all
select 2,N'3,4'
Go
create function F_str(@cname nvarchar(100))
returns nvarchar(100)
as
begin
select @cname=replace(@cname,ID,[cname]) from A where patindex('%,'+rtrim(ID)+',%',','+@cname+',')>0
return @cname
end
go
select [id],dbo.F_str([cname])[cname] from B
id cname
----------- ----------------------------------------------------------------------------------------------------
1 张三,李四,王五
2 王五,蔡六
(2 個資料列受到影響)
[code=SQL]/*
标题:按某字段合并字符串之一(简单合并)
作者:爱新觉罗.毓华(十八年风雨,守得冰山雪莲花开)
时间:2008-11-06
地点:广东深圳
描述:将如下形式的数据按id字段合并value字段。
id value
----- ------
1 aa
1 bb
2 aaa
2 bbb
2 ccc
需要得到结果:
id value
------ -----------
1 aa,bb
2 aaa,bbb,ccc
即:group by id, 求 value 的和(字符串相加)
*/
--1、sql2000中只能用自定义的函数解决
create table tb(id int, value varchar(10))
insert into tb values(1, 'aa')
insert into tb values(1, 'bb')
insert into tb values(2, 'aaa')
insert into tb values(2, 'bbb')
insert into tb values(2, 'ccc')
go
create function dbo.f_str(@id int) returns varchar(100)
as
begin
declare @str varchar(1000)
set @str = ''
select @str = @str + ',' + cast(value as varchar) from tb where id = @id
set @str = right(@str , len(@str) - 1)
return @str
end
go
--调用函数
select id , value = dbo.f_str(id) from tb group by id
drop function dbo.f_str
drop table tb
--2、sql2005中的方法
create table tb(id int, value varchar(10))
insert into tb values(1, 'aa')
insert into tb values(1, 'bb')
insert into tb values(2, 'aaa')
insert into tb values(2, 'bbb')
insert into tb values(2, 'ccc')
go
select id, [value] = stuff((select ',' + [value] from tb t where id = tb.id for xml path('')) , 1 , 1 , '')
from tb
group by id
drop table tb
--3、使用游标合并数据
create table tb(id int, value varchar(10))
insert into tb values(1, 'aa')
insert into tb values(1, 'bb')
insert into tb values(2, 'aaa')
insert into tb values(2, 'bbb')
insert into tb values(2, 'ccc')
go
declare @t table(id int,value varchar(100))--定义结果集表变量
--定义游标并进行合并处理
declare my_cursor cursor local for
select id , value from tb
declare @id_old int , @id int , @value varchar(10) , @s varchar(100)
open my_cursor
fetch my_cursor into @id , @value
select @id_old = @id , @s=''
while @@FETCH_STATUS = 0
begin
if @id = @id_old
select @s = @s + ',' + cast(@value as varchar)
else
begin
insert @t values(@id_old , stuff(@s,1,1,''))
select @s = ',' + cast(@value as varchar) , @id_old = @id
end
fetch my_cursor into @id , @value
END
insert @t values(@id_old , stuff(@s,1,1,''))
close my_cursor
deallocate my_cursor
select * from @t
drop table tb
[/code]