27,579
社区成员
发帖
与我相关
我的任务
分享
if object_id('[T_MessageTagsRel]') is not null drop table [T_MessageTagsRel]
go
create table [T_MessageTagsRel]([RID] int,[MessageID] int,[TagsNo] varchar(3))
insert [T_MessageTagsRel]
select 1,15,'001' union all
select 2,15,'002' union all
select 3,16,'001' union all
select 4,16,'002' union all
select 5,16,'003'
if object_id('[T_MessagTags]') is not null drop table [T_MessagTags]
go
create table [T_MessagTags]([TagsID] int,[TagsNo] varchar(3),[TagsName] varchar(10))
insert [T_MessagTags]
select 1,'001','重要客户' union all
select 2,'002','紧急' union all
select 3,'003','近日要处理'
with t as
(select messageid,tagsname from t_messagetagsrel a inner join t_messagtags b on a.tagsno=b.tagsno
)
select messageid,stuff((select ','+tagsname from t where messageid=b.messageid for xml path('')),1,1,'') from t b group by messageid
15 重要客户,紧急
16 重要客户,紧急,近日要处理
(2 行受影响)
--sql2000
--> 测试数据:[T_MessageTagsRel]
if object_id('[T_MessageTagsRel]') is not null drop table [T_MessageTagsRel]
create table [T_MessageTagsRel]([RID] int,[MessageID] int,[TagsNo] varchar(3))
insert [T_MessageTagsRel]
select 1,15,'001' union all
select 2,15,'002' union all
select 3,16,'001' union all
select 4,16,'002' union all
select 5,16,'003'
--> 测试数据:[T_MessagTags]
if object_id('[T_MessagTags]') is not null drop table [T_MessagTags]
create table [T_MessagTags]([TagsID] int,[TagsNo] varchar(3),[TagsName] varchar(10))
insert [T_MessagTags]
select 1,'001','重要客户' union all
select 2,'002','紧急' union all
select 3,'003','近日要处理'
create function f_getvar(@MessageID int)
returns varchar(4000)
as begin
declare @s varchar(4000)
select @s=isnull(@s+',','')+TagsName
from T_MessageTagsRel a,T_MessagTags b
where a.TagsNo=b.TagsNo and MessageID=@MessageID
return @s
end
select MessageID,
value=dbo.f_getvar(MessageID)
from [T_MessageTagsRel]
group by MessageID
/*
MessageID value
----------- ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
15 重要客户,紧急
16 重要客户,紧急,近日要处理
(所影响的行数为 2 行)
*/
drop table T_MessageTagsRel,T_MessagTags
drop function f_getvar
----------------------------------------------------------------
-- Author :fredrickhu(小F,向高手学习)
-- Date :2010-04-22 16:00:55
-- Verstion:
-- Microsoft SQL Server 2005 - 9.00.4053.00 (Intel X86)
-- May 26 2009 14:24:20
-- Copyright (c) 1988-2005 Microsoft Corporation
-- Developer Edition on Windows NT 5.1 (Build 2600: Service Pack 3)
--
----------------------------------------------------------------
--> 测试数据:[T_MessageTagsRel]
if object_id('[T_MessageTagsRel]') is not null drop table [T_MessageTagsRel]
go
create table [T_MessageTagsRel]([RID] int,[MessageID] int,[TagsNo] varchar(3))
insert [T_MessageTagsRel]
select 1,15,'001' union all
select 2,15,'002' union all
select 3,16,'001' union all
select 4,16,'002' union all
select 5,16,'003'
--> 测试数据:[T_MessagTags]
if object_id('[T_MessagTags]') is not null drop table [T_MessagTags]
go
create table [T_MessagTags]([TagsID] int,[TagsNo] varchar(3),[TagsName] varchar(10))
insert [T_MessagTags]
select 1,'001','重要客户' union all
select 2,'002','紧急' union all
select 3,'003','近日要处理'
--------------开始查询--------------------------
;with f as
(
select
a.[MessageID],b.[TagsName]
from
[T_MessageTagsRel] a,[T_MessagTags] b
where
a.[TagsNo]=b.[TagsNo]
)
select
MessageID, [TagsName]=stuff((select ','+[TagsName] from f where MessageID=t.MessageID for xml path('')), 1, 1, '')
from
f t
group by
MessageID
----------------结果----------------------------
/* MessageID TagsName
----------- ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
15 重要客户,紧急
16 重要客户,紧急,近日要处理
(2 行受影响)
*/
--------------------SQL Server数据格式化工具-------------------
---------------------------------------------------------------
-- DESIGNER :happycell188(喜喜)
-- QQ :584738179
-- Development Tool :Microsoft Visual C++ 6.0 C Language
-- FUNCTION :CONVERT DATA TO T-SQL
---------------------------------------------------------------
-- Microsoft SQL Server 2005
-- Developer Edition on Microsoft Windows XP [版本 5.1.2600]
---------------------------------------------------------------
---------------------------------------------------------------
use test
go
if object_id('test.dbo.T_MessageTagsRel') is not null drop table T_MessageTagsRel
-- 创建数据表
create table T_MessageTagsRel
(
RID int,
MessageID int,
TagsNo char(4)
)
go
--插入测试数据
insert into T_MessageTagsRel select 1,15,'001'
union all select 2,15,'002'
union all select 3,16,'001'
union all select 4,16,'002'
union all select 5,16,'003'
go
if object_id('test.dbo.T_MessagTags') is not null drop table T_MessagTags
-- 创建数据表
create table T_MessagTags
(
TagsID int,
TagsNo char(4),
TagsName char(10)
)
go
--插入测试数据
insert into T_MessagTags select 1,'001','重要客户'
union all select 2,'002','紧急'
union all select 3,'003','近日要处理'
go
--代码实现
;with ttt as (select MessageID,TagsName from T_MessageTagsRel a,T_MessagTags b where a.TagsNo=b.TagsNo)
select MessageID,Tags=stuff((select ','+rtrim(TagsName) from ttt where MessageID=t.MessageID for xml path('')),1,1,'') from ttt t
group by MessageID
/*测试结果
MessageID Tags
---------------------
15 重要客户,紧急
16 重要客户,紧急,近日要处理
(2 行受影响)
*/
if object_id('[T_MessageTagsRel]') is not null drop table [T_MessageTagsRel]
go
create table [T_MessageTagsRel]([RID] int,[MessageID] int,[TagsNo] varchar(3))
insert [T_MessageTagsRel]
select 1,15,'001' union all
select 2,15,'002' union all
select 3,16,'001' union all
select 4,16,'002' union all
select 5,16,'003'
if object_id('[T_MessagTags]') is not null drop table [T_MessagTags]
go
create table [T_MessagTags]([TagsID] int,[TagsNo] varchar(3),[TagsName] varchar(10))
insert [T_MessagTags]
select 1,'001','重要客户' union all
select 2,'002','紧急' union all
select 3,'003','近日要处理'
select a.MessageID,
stuff((select ','+TagsName from T_MessageTagsRel c,T_MessagTags d where c.TagsNo=d.TagsNo and a.MessageID=c.MessageID for xml path('')),1,1,'')
from T_MessageTagsRel a
join T_MessagTags b on a.TagsNo=b.TagsNo
group by a.MessageID
/**
MessageID
----------- ------------------------------------------
15 重要客户,紧急
16 重要客户,紧急,近日要处理
(2 行受影响)
**/
合并列值
--*******************************************************************************************
表结构,数据如下:
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(在sql server 2000中只能用函数解决。)
--=============================================================================
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
--1. 创建处理函数
CREATE FUNCTION dbo.f_strUnite(@id int)
RETURNS varchar(8000)
AS
BEGIN
DECLARE @str varchar(8000)
SET @str = ''
SELECT @str = @str + ',' + value FROM tb WHERE id=@id
RETURN STUFF(@str, 1, 1, '')
END
GO
-- 调用函数
SELECt id, value = dbo.f_strUnite(id) FROM tb GROUP BY id
drop table tb
drop function dbo.f_strUnite
go
/*
id value
----------- -----------
1 aa,bb
2 aaa,bbb,ccc
(所影响的行数为 2 行)
*/
--===================================================================================
2. 新的解决方法(在sql server 2005中用OUTER APPLY等解决。)
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
-- 查询处理
SELECT * FROM(SELECT DISTINCT id FROM tb)A OUTER APPLY(
SELECT [values]= STUFF(REPLACE(REPLACE(
(
SELECT value FROM tb N
WHERE id = A.id
FOR XML AUTO
), '<N value="', ','), '"/>', ''), 1, 1, '')
)N
drop table tb
/*
id values
----------- -----------
1 aa,bb
2 aaa,bbb,ccc
(2 行受影响)
*/
--SQL2005中的方法2
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, [values]=stuff((select ','+[value] from tb t where id=tb.id for xml path('')), 1, 1, '')
from tb
group by id
/*
id values
----------- --------------------
1 aa,bb
2 aaa,bbb,ccc
(2 row(s) affected)
*/
drop table tb