1.ms sql
with cte as
(select id,pid,deptname, 0 as lvl from department
where id = 2
union all
select d.id,d.pid,d.deptname,lvl + 1 from cte c inner join department d
on c.id = d.pid
)select * from cte
2.oracle
一、建表
create table users.tbl_test
(id number,
name varchar2(100 byte),
pid number default 0
)insert into tbl_test(id,name,pid) values('1','10','0');
insert into tbl_test(id,name,pid) values('2','11','1'
insert into tbl_test(id,name,pid) values('3','20','0');
insert into tbl_test(id,name,pid) values('4','12','1');
insert into tbl_test(id,name,pid) values('5','121','2');
二、格式
select * from …. where [結果過濾條件語句]
start with [and起始條件過濾語句]
connect by prior [and中間記錄過濾條件語句]
三、查詢所有下級
select * from tbl_test start with id=1 connect by prior id=pid
注意：此sql能查詢id=1的資料的所有下級，寫sql語句時要注意，因為是從id開始查詢下級，所以connect by prior 子句的條件是id=pid
四、查詢所有上級
select * from tbl_test start with id=5 connect by prior pid=id
因為是從id開始查詢上級，所以connect by prior 子句的條件是pid=d
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