How to split a string in SQL as multi-column

--首先，你是按什么规则拆？ 我举个例子 你要按字段中的逗号拆开，假设字段名叫text

--用charindex和substring这2个函数   

select substring(text,1,charindex(',',text)-1) as [before]
,substring(text,charindex(',',text),len(text)) as [after]
from table