oracle olap函数（续）

/*connect by函数*/
CREATE TABLE 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');
INSERT INTO TBL_TEST(ID,NAME,PID) VALUES('6','126','2');
INSERT INTO TBL_TEST(ID,NAME,PID) VALUES('7','127','1');
commit;
--从Root往树末梢递归
select * from TBL_TEST
start with id=1
connect by prior id = pid
order by pid,id
--从末梢往树ROOT递归
select * from TBL_TEST
start with id=5
connect by prior pid=id
/*lead下一个  lag上一个*/
create table LEAD_TABLE
(
  CASEID     VARCHAR2(10),
  STEPID     VARCHAR2(10),
  ACTIONDATE DATE
);
  insert into LEAD_TABLE values('Case1','Step1',to_date('20070101','yyyy-mm-dd'));
  insert into LEAD_TABLE values('Case1','Step2',to_date('20070102','yyyy-mm-dd'));
  insert into LEAD_TABLE values('Case1','Step3',to_date('20070103','yyyy-mm-dd'));
  insert into LEAD_TABLE values('Case1','Step4',to_date('20070104','yyyy-mm-dd'));
  insert into LEAD_TABLE values('Case1','Step5',to_date('20070105','yyyy-mm-dd'));
  insert into LEAD_TABLE values('Case1','Step4',to_date('20070106','yyyy-mm-dd'));
  insert into LEAD_TABLE values('Case1','Step6',to_date('20070101','yyyy-mm-dd'));
  insert into LEAD_TABLE values('Case1','Step1',to_date('20070201','yyyy-mm-dd'));
  insert into LEAD_TABLE values('Case2','Step2',to_date('20070202','yyyy-mm-dd'));
  insert into LEAD_TABLE valu