Sql function 多行中的列合并为一行一列的方法

create table tb(standards varchar(50), amount varchar(50), variation varchar(50),statuss varchar(50),reason varchar(50))
insert into tb values('55','279','4','物量积压','加工人员设备不足;t排制作进度较慢;')
insert into tb values('55','279','4','物量积压','部件人员不足;')
insert into tb values('55','279','4','物量积压','跨间场地积压;图纸问题较多;')
insert into tb values('56','300','4','物量积压','aaaa;')
insert into tb values('56','300','4','物量积压','bbbb;')
insert into tb values('56','300','4','物量积压','cccc;')

create function test(@standards varchar(100))
returns varchar(8000)
as
begin
declare @re varchar(500)
set @re = ''
select @re = @re+','+reason
from tb
where @standards=standards
return (stuff(@re,1,1,''))
end

调用

select distinct standards,amount,variation,statuss,reason = dbo.test('55') from tb where standards=55
select distinct standards,amount,variation,statuss,reason = dbo.test('56') from tb where standards=56