PostgreSQL递归查询

原料

--创建组织架构表
create table "Org"(
    "OrgId" character varying(50) primary key,"ParentId" character varying(50),"OrgName" character varying(50)
)
--添加数据
insert into "Org" ("OrgId","ParentId","OrgName") values(‘00‘,null,‘***集团‘);
insert into "Org" ("OrgId","OrgName") values(‘01‘,‘00‘,‘子公司01‘);
insert into "Org" ("OrgId","OrgName") values(‘02‘,‘子公司02‘);
insert into "Org" ("OrgId","OrgName") values(‘03‘,‘子公司03‘);
insert into "Org" ("OrgId","OrgName") values(‘04‘,‘子公司04‘);

insert into "Org" ("OrgId","OrgName") values(‘0101‘,‘01‘,‘电子商务部‘);
insert into "Org" ("OrgId","OrgName") values(‘0102‘,‘渠道合作部‘);
insert into "Org" ("OrgId","OrgName") values(‘0103‘,‘个人业务部‘);
insert into "Org" ("OrgId","OrgName") values(‘0104‘,‘人力资源部‘);
insert into "Org" ("OrgId","OrgName") values(‘0105‘,‘运营管理部‘);

insert into "Org" ("OrgId","OrgName") values(‘0201‘,‘02‘,"OrgName") values(‘0202‘,"OrgName") values(‘0203‘,"OrgName") values(‘0204‘,"OrgName") values(‘0205‘,"OrgName") values(‘0301‘,‘03‘,"OrgName") values(‘0302‘,"OrgName") values(‘0303‘,"OrgName") values(‘0304‘,"OrgName") values(‘0305‘,"OrgName") values(‘0401‘,‘04‘,"OrgName") values(‘0402‘,"OrgName") values(‘0403‘,"OrgName") values(‘0404‘,"OrgName") values(‘0405‘,‘运营管理部‘);

View Code

向下递归

--向下递归
with recursive T ("OrgId","OrgName","Depth")  AS 
(
    select "OrgId",1 "Depth" from "Org" where "OrgId"=‘01‘  --起始节点
    union all
    select  D."OrgId",D."ParentId",D."OrgName",T."Depth" + 1 "Depth" from "Org" D join T on D."ParentId" = T."OrgId"
)
select "OrgId","Depth" from T

输出结果：

 

向上递归

--向上递归
with recursive T ("OrgId",1 "Depth" from "Org" where "OrgId"=‘0105‘  --起始节点
    union all
    select  D."OrgId",T."Depth" + 1 "Depth" from "Org" D join T on D."OrgId" = T."ParentId"
)
select "OrgId","Depth" from T

输出结果：