mysql connect by prior start with_start with connect by prior 递归查询用法

这个子句主要是用于B树结构类型的数据递归查询，给出B树结构类型中的任意一个结点，遍历其最终父结点或者子结点。

先看原始数据：

create table a_test

( parentid varchar2(10),

subid varchar2(10));insert into a_test values ( '1', '2' );insert into a_test values ( '1', '3' );insert into a_test values ( '2', '4' );insert into a_test values ( '2', '5' );insert into a_test values ( '3', '6' );insert into a_test values ( '3', '7' );insert into a_test values ( '5', '8' );insert into a_test values ( '5', '9' );insert into a_test values ( '7', '10' );insert into a_test values ( '7', '11' );insert into a_test values ( '10', '12' );insert into a_test values ( '10', '13' );commit;select * from a_test;

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mysql connect by prior start with_start with connect by prior 递归查询用法

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