摘要: 实例1: select dm,dm,level cjdm, sys_connect_by_path(dm,'/') from ( select '1' sjdm,'11' dm from dual union all select '11' sjdm,'111' dm from dual union 阅读全文
posted @ 2019-07-17 16:24 周家飞少 阅读(237) 评论(0) 推荐(0) 编辑