oracle树结构查询

1.根据父节点递归查询所有子节点

SELECT distinct LPAD('',2*(LEVEL - 1),'')||ORGCODE AS organCode,

　　PARENT_CODE AS panrentCode

　　FROM t_organ

　　START WITH ORGCODE =父节点编码

　　CONNECT BY PARENT_CODE = PRIOR ORGCODE ;

2.根据子节点递归查询所有父节点

SELECT distinct LPAD('',2*(LEVEL - 1),'')||ORGCODE AS organCode,

　　PARENT_CODE AS panrentCode

　　FROM t_organ

　　START WITH ORGCODE =父节点编码

　　CONNECT BY PRIOR PARENT_CODE =  ORGCODE ;