问一个常用sql语句,先谢了.
本帖最后由 a291410855 于 2013-07-19 15:54:39 编辑 主表,
1 name1
2 name2,
子表,
1 1 d1
2 1 d2
3 2 d3,
4 2 d4
如何得到
1 name1 d1,d2
2 name2 d3,d4

主表的第一列与子表的第二列关联.

[解决办法]

with tb (a,b) as(
select 1,'name1' union
select 2,'name2'
),tc(a,b)as(
select 1,'d1' union
select 1,'d2' union
select 2,'d3' union
select 2,'d4'
)
select distinct *,
stuff((select ','+b from tc where tb.a=tc.a for xml path('')),1,1,'') from tb

----------------------------
-- Author  :DBA_Huanzj（）

-- Version:
--      Microsoft SQL Server 2012 (SP1) - 11.0.3000.0 (X64) 
--Oct 19 2012 13:38:57 
--Copyright (c) Microsoft Corporation
--Enterprise Evaluation Edition (64-bit) on Windows NT 6.2 <X64> (Build 9200: )
--
----------------------------
--> 测试数据：[A]
if object_id('[A]') is not null drop table [A]
go 
create table [A]([id] int,[name] varchar(5))
insert [A]
select 1,'name1' union all
select 2,'name2'

--> 测试数据：[B]
if object_id('[B]') is not null drop table [B]
go 
create table [B]([id] int,[aid] int,[bname] varchar(3))
insert [B]
select 1,1,'d1' union all
select 2,1,'d2' union all
select 3,2,'d3' union all
select 4,2,'d4'
--------------开始查询--------------------------
select a.id,a.name,b.bname from [A] a inner join ( 
 
select a.[aid],
stuff((select ','+[bname] from [B] b 
       where b.[aid]=a.[aid]  
       for xml path('')),1,1,'') 'bname'
from [B] a
group by  a.[aid])b on a.id=b.aid


----------------结果----------------------------
/* 
id          name  bname
----------- ----- ----------------------------------------------------------------------------------------------------------------
1           name1 d1,d2
2           name2 d3,d4

*/

create table 主表
(a int, b varchar(10))

insert into 主表
 select 1, 'name1' union all
 select 2, 'name2'
 
create table 子表
(a int,b int,c varchar(10))

insert into 子表
 select 1, 1, 'd1' union all
 select 2, 1, 'd2' union all
 select 3, 2, 'd3' union all
 select 4, 2, 'd4'
 

create function fn(@a int)
returns varchar(20)
as
begin
 declare @r varchar(20)

 select @r=isnull(@r,'')+','+c
   from 子表
   where b=@a
 
 return stuff(@r,1,1,'')
end


select a,b,dbo.fn(a) 'c'
 from 主表

/*
a           b          c
----------- ---------- --------------------
1           name1      d1,d2
2           name2      d3,d4

(2 row(s) affected) 
 
*/