oracle 逗号分隔的字符串列字段查询列出多条记录

表名（id, 逗号分隔的列名）

select id, 逗号分隔的列名from (select distinct id,
       regexp_substr(逗号分隔的列名, '[^,]+', 1, level) 逗号分隔的列名
  from 表名 where 逗号分隔的列名 is not null
connect by level <= regexp_count(逗号分隔的列名, ',') + 1
       and id = prior id
      and prior dbms_random.value is not null