单列多值数据转化成多行在SQLSERVER中的实现

WITH test AS (
SELECT 1 ID ,‘13811111111,13311111111,13900000000‘ phone --FROM dual
UNION ALL
SELECT 2,‘15811111111,15911111111,18800000000‘ --FROM dual
)
, cte as(
select ID,phone,SUBSTRING(phone,1,LEN(phone)- CHARINDEX(‘,‘,REVERSE(phone))) leftphone
    ,SUBSTRING(phone,LEN(phone)- CHARINDEX(‘,‘,REVERSE(phone))+2,CHARINDEX(‘,‘,REVERSE(phone))) newphone
from test
union all
select  ID,leftphone,SUBSTRING(leftphone,1,LEN(leftphone)- CHARINDEX(‘,‘,REVERSE(leftphone))) leftphone
    ,SUBSTRING(leftphone,LEN(leftphone)- CHARINDEX(‘,‘,REVERSE(leftphone))+2,CHARINDEX(‘,‘,REVERSE(leftphone))) newphone
from cte
where newphone<>‘‘
)

select ID, case when newphone=‘‘ then leftphone else newphone end as phone
from cte
order by 1