注：先學習sql server裡的遞迴CTE。

假設有興趣表Hobbys

採用【遞迴cte】

with tempHobbys as
 
 (select Name,Hobby,charindex(',',Hobby)-1 endindex,0 startindex from Hobbys 
union all 
select Name,Hobby,charindex(',',Hobby,endindex+2)-1 endindex,endindex+2 startindex from tempHobbys where endindex>-1),
with tempHobbys 2 as (select Name,Hobby,(case when endindex<0 then len(Hobby) else Hobby end
 
) endindex,startindex from tempHobbys)
select Name,substring(Hobby,startindex,endindex-startindex+1) Hobby from tempHobbys2