oracle字符串拆分转义？
wm_concat非标准函数，不保证以后会支持
标准写法：
with t as (select name,row_number() over(order by name) rn from 表)
select name, rn, sys_connect_by_path(name, ',') path
from t
start with rn=1 connect by prior rn+1=rn
