SQL函數將某個字段合並在一起的操作

ALTER function dbo.getResCodesByOwnerId(@OwnerId INT)
returns nvarchar(2000)
as
begin
DECLARE @codes VARCHAR(2000)
SET @codes=''
select @codes=stuff((select ','+residence_code from crm_owner co left join crm_owner_residence cor on co.id=cor.owner_id where co.id=@OwnerId for xml path('')),1,1,'')
return @codes
END

select (數據庫名).getResCodesByOwnerId(fr.owner_id) as room_code
from t1 fr left join t2 frd on fr.owner_id=frd.owner_id

1101010105,11GU002,1101010104

create table tb(idint, value varchar(10))
insert into tbvalues(1,'aa')
insert into tbvalues(1,'bb')
insert into tbvalues(2,'aaa')
insert into tbvalues(2,'bbb')
insert into tbvalues(2,'ccc')
go
 
/*     stuff(param1, startIndex, length, param2)

SELECT id,
           value = stuff
             ((SELECT   ',' + value
               FROM     tb AS t
               WHERE   t .id = tb.id FOR xml path('')), 1, 1, '')
FROM     tb
GROUP BY id

/* 
標題：按某字段合並字符串之一(簡單合並) 
作者：(十八年風雨,守得冰山雪蓮花開) 
地點：廣東深圳 
 
描述：將如下形式的數據按id字段合並value字段。 
id  value 
----- ------  
1   aa 
1   bb 
2   aaa 
2   bbb 
2   ccc 
需要得到結果： 
id   value 
------ -----------  
1   aa,bb 
2   aaa,bbb,ccc 
即：group by id, 求 value 的和（字符串相加） 
*/ 
--1、sql2000中隻能用自定義的函數解決  
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 varchar(10)) returns varchar(1000) 
as 
begin 
 declare @str varchar(1000) 
 select @str = isnull(@str + ',' , '') + cast(value as varchar) from tb where id = @id 
 return @str 
end 
go 
 
--調用函數  
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、使用遊標合並數據  
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))--定義結果集表變量  
--定義遊標並進行合並處理  
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