create table test1(superid varchar2(20),id varchar2(20));
insert into test1 values('0','1');
insert into test1 values('0','2');
insert into test1 values('1','11');
insert into test1 values('1','12');
insert into test1 values('2','21');
insert into test1 values('2','22');
insert into test1 values('11','111');
insert into test1 values('11','112');
insert into test1 values('12','121');
insert into test1 values('12','122');
insert into test1 values('21','211');
insert into test1 values('21','212');
insert into test1 values('22','221');
insert into test1 values('22','222');
commit;
select * from test1
select level||' layer',lpad(' ',level*5)||id id ,connect_by_isleaf
from test1
start with superid = '0' connect by prior id=superid;
select level||' layer',lpad(' ',level*5)||id id ,connect_by_isleaf,substr( sys_connect_by_path(id,'>'),2)
from test1
where connect_by_isleaf=1
start with superid = '0' connect by prior id=superid;
--------------Join -------------
select level||' layer',lpad(' ',level*5)||id id ,connect_by_isleaf,substr( sys_connect_by_path(id,'>'),2)
from test1 ,(select 111 col from dual) tmp
where tmp.col=to_number(test1.id)
start with superid = '0' connect by prior id=superid;
--------------Where -------------
select level||' layer',lpad(' ',level*5)||id id ,connect_by_isleaf,substr( sys_connect_by_path(id,'>'),2)
from test1
where 111=to_number(test1.id)
start with superid = '0' connect by prior id=superid;