DB2递归查询
在db2可以使用sql语句来进行递归查询,就是使用with语句1.先建一个树形表:
create table tst (
id integer,
parentId int,
name varchar(20))
2.插入数据
insert into tst values
(1,0,'a'),
(2,0,'b'),
(3,1,'c'),
(4,1,'d'),
(5,4,'d'),
(6,5,'d')
3.使用递归查询
with rpl (id,parentId,name) as
(
select id,parentId,name from tst where parentId=1
union all
select child.id,child.parentId,child.name from rpl parent, tst child where parent.id=child.parentId
)
select * from rpl
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