oracle REGEXP_SUBSTR实现字符串转列

如将字符串‘张三,李四,王五,赵六,'转换成

1.  张三

2.李四

3.王五

4.赵六

 

REGEXP_SUBSTR

查询语句：

 WITH TEST AS (SELECT  ‘张三,李四,王五,赵六,' AS STR FROM DUAL)
 SELECT DISTINCT REGEXP_SUBSTR(STR, '[^,]+', 1, LEVEL)
 FROM TEST
 CONNECT BY LEVEL<=LENGTH(STR)-LENGTH(REGEXP_REPLACE(STR,',',''))+1