标签:_id acl code pid 条件 节点 查询 ble 区别
oracle:
一、数据
db数据字段如下:
二、格式
Select * from …. Where [结果过滤条件语句]
Start with [and起始条件过滤语句]
Connect by prior [and中间记录过滤条件语句]
三、查找所有下级
select * from tablename start with id=1 connect by prior id=pid
注意:此sql能查找id=1的数据的所有下级,写sql语句时要注意,因为是从id开始查找下级,所以connect by prior 子句的条件是 id=pid
四、查找所有上级
select * from tablename start with id=5 connect by prior pid=id
因为是从id开始查找上级,所以connect by prior 子句的条件是pid=d
select t.task_id ,t.task_name ,t.parent_task_id from t_task t start with task_id=‘000001‘ connect by prior task_id = parent_task_id;
五、显示结果
结果显示:
postgresql:
查询父节点下所有的子节点
WITH recursive fileinfo (pk_fi_id, f_fi_parentid) AS ( SELECT pk_fi_id , f_fi_parentid FROM t_fileinfo WHERE pk_fi_id = ‘92719f78-22d6-4db1-a484-dff34de76890‘ UNION ALL SELECT mm.pk_fi_id , mm.f_fi_parentid FROM t_fileinfo AS mm INNER JOIN fileinfo AS child ON mm.f_fi_parentid = child.pk_fi_id ) SELECT * FROM fileinfo
oracle和postgresql 递归查询父子关系记录语法区别
标签:_id acl code pid 条件 节点 查询 ble 区别
原文地址:http://www.cnblogs.com/lingbing/p/6092928.html