mysql8 postgresql 遞迴查詢一條SQL支援帝國查詢
阿新 • • 發佈:2022-12-05
建立表
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create table tb(id varchar(3) , pid varchar(3) , name varchar(10)); insert into tb values('002' , 0 , '浙江省'); insert into tb values('001' , 0 , '廣東省'); insert into tb values('003' , '002' , '衢州市'); insert into tb values('004' , '002' , '杭州市') ; insert into tb values('005' , '002' , '湖州市'); insert into tb values('006' , '002' , '嘉興市') ; insert into tb values('007' , '002' , '寧波市'); insert into tb values('008' , '002' , '紹興市') ; insert into tb values('009' , '002' , '台州市'); insert into tb values('010' , '002' , '溫州市') ; insert into tb values('011' , '002' , '麗水市'); insert into tb values('012' , '002' , '金華市') ; insert into tb values('013' , '002' , '舟山市'); insert into tb values('014' , '004' , '上城區') ; insert into tb values('015' , '004' , '下城區'); insert into tb values('016' , '004' , '拱墅區') ; insert into tb values('017' , '004' , '餘杭區') ; insert into tb values('018' , '011' , '金東區') ; insert into tb values('019' , '001' , '廣州市') ; insert into tb values('020' , '001' , '深圳市') ;
遞迴查詢
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with RECURSIVE cte as
(
select a.id, a.name from tb a where id = '002'
union all
select k.id, k.name from tb k inner join cte c on c.id = k.pid
)
select id, name from cte;