sqlserver模仿mysql函数FIND_IN_SET,group_concat的功能

SELECT id,
val=( SELECT [value] +','
FROM tb AS b
WHERE b.id = a.id
FOR XML PATH('')  )
FROM tb AS a
GROUP BY id

SELECT id,
[val]=STUFF( (SELECT ','+[value]
FROM tb AS b
WHERE b.id = a.id
FOR XML PATH('')) , 1 , 1 , '' )
FROM tb AS a
GROUP BY id

--删除、创建临时表
drop table #table1;
select * into #table1
from (
SELECT myId,'auto' as type
)allData
--把数据按myId分类链接，然后按链接后数据的长度倒序排序
select * from (
select myId,
val=STUFF( (SELECT '、'+type
FROM #table1 AS b
WHERE b.myId = ta.myId
FOR XML PATH('')) , 1 , 1 , '' )
from #table1 ta
group by myId
) dd order by LEN(val) desc