oracle sql ，分隔的字段行转列查询

--将查询的，分隔的字段从行转成列
select REGEXP_SUBSTR(ids, '[^,]+', 1, rownum) AS ids
from (
         select listagg(ids, ',') WITHIN GROUP ( ORDER by ID) ids
         from t_table
    )
connect by rownum <= (SELECT regexp_count(ids, ',') + 1 FROM dual);

--解释

t_table 为表名称

ids为，分隔的字段