oracle 将以逗号分隔的列拆成多行的的方法

原表如下

select * from hs_acct.custattach a where a.client_id='888827395';

将列拆分成多行的语句

select
*
from
(
  ----将列拆分成多行的语句
  select distinct a.client_id
     ,REGEXP_SUBSTR(a.en_branch_no, '[^,]+', 1, L) AS en_branch_no
  from hs_acct.custattach a, (SELECT LEVEL L FROM DUAL CONNECT BY LEVEL <= 10000) b
  WHERE b.L(+) <= LENGTH(a.en_branch_no) - LENGTH(REPLACE(a.en_branch_no, ',')) + 1
) tt
where trim(tt.en_branch_no) is not null
and tt.client_id='888827395';