Oracle connect by prior查询用法

参考地址：https://blog.csdn.net/qq_33656602/article/details/77750576

如果表中存在层次数据，则可以使用层次化查询子句查询出表中行记录之间的层次关系

基本语法： 

[ START WITH CONDITION1 ]

CONNECT BY [ NOCYCLE ] CONDITION2

[ NOCYCLE ]

 

用法示例：

SELECT t.* FROM Score_Model t WHERE t.id = 552 OR t.pid = 552

SELECT t.* FROM Score_Model t START WITH t.id = 552 CONNECT BY PRIOR t.id = t.pid

SELECT t.* FROM Score_Model t START WITH t.id = 553 CONNECT BY t.id = PRIOR t.pid

SELECT t.* FROM Score_Model t START WITH t.id = 554 CONNECT BY t.id = PRIOR t.pid