oracle connect by用法

就不转载原文了,来个更加简单易懂的说法.有数据表 a:no upno010102 0101010101 01010101 0101select * from a start with no='010101' connect by no=prior upno;查询结果为:010101010101将upno和no换个位置:select * from a start with no='0101' connect by upno=prior no;查询结果为:0101010101010102注:

select
* from emp connect by upno=prior no start with no=

'0101'

;

//与select
* from a start with no='0101' connect by upno=prior no;效果一致

与select
* from emp connect by prior upno=no start with no='0101';效果相反

重点在于prior的位置

原文:http://www.cnblogs.com/linjiqin/p/3152690.html:

select * from a start with no='010101' connect by no=prior upno;