SQL function to merge a field together

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 (database name).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

/* 
Title: One of the strings merged by a field (simple merge) 
Author: (After 18 years of wind and rain, the snow lotus blooms on the iceberg) 
Location: Shenzhen, Guangdong Description: Merge the following data into the value field according to the id field. 
id value 
----- ------  
1aa 
1 bb 
2 aaa 
2 bbb 
2 ccc 
Need to get the result: 
id value 
------ -----------  
1 aa,bb 
2 aaa,bbb,ccc 
That is: group by id, find the sum of value (string addition) 
*/ 
--1. In sql2000, you can only use custom functions to solve 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 
 
--Call function select id, value = dbo.f_str(id) from tb group by id 
 
drop function dbo.f_str 
drop table tb  
 
--2. Method create table tb(id int, value varchar(10)) in sql2005 
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. Use cursor to merge data 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))--define result set table variable--define cursor and merge process 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