oracle字符串拆分轉義？
wm_concat非標準函數，不保證以后會支持
標準寫法：
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
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