技術標籤：# oracle

建立測試表，增加測試資料

create table test(superid varchar2(20),id varchar2(20));

insert into test values('0','1');
insert into test values('0','2');

insert into test values('1','11');
insert into test values('1','12');

insert into test values('2','21');
insert into test values('2','22');

insert
 
 into test values('11','111');
insert into test values('11','112');

insert into test values('12','121');
insert into test values('12','122');

insert into test values('21','211');
insert into test values('21','212');

insert into test values('22','221');
insert into test values('22','222');

commit
 
;

在上表中查詢id=11相關聯的所有的父節點以及所有的子節點資料，級聯sql如下：

select id,superid from TEST t start with id='11' connect by prior superId = id
UNION
select id,superid from TEST t start with id='11' connect by prior id = superId

查詢結果如下圖：

在上表中查詢id=11相關聯的所有的父節點資料，級聯sql如下：

select id,superid from TEST t start with id='11'
 
 connect by prior superId = id

查詢結果如下圖：

在上表中查詢id=11相關聯的所有的子節點資料，級聯sql如下：

select id,superid from TEST t start with id='11' connect by prior id = superId

查詢結果如下圖：

在上表中查詢id=1的本身級子級為2層的資料 ，級聯sql如下：

select id,superid from TEST t start with id='1' connect by prior id = superId and level <= 2

查詢結果如下圖：