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
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：按某字段合并字符串之一(簡單合并)
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字段合并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中只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、使用游標合并數據
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
--定義游標并進行合并處理
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
