mgr

----------------------------multitable insert--------------------------------
----------------insert all----------------------------------------------------
select * from emp ;

create table sal_history (
empid NUMBER(4),hiredate date, SAL number(7,2)
);
create table mgr_history (
empid NUMBER(4), mgr number(4),SAL number(7,2)

);

INSERT ALL
INTO sal_history VALUES(EMPID,HIREDATE,SAL)
INTO mgr_history VALUES(EMPID,MGR,SAL)
SELECT empno EMPID, HIREDATE, SAL, MGR
FROM emp
WHERE empno < 7654 ;

commit ;

select * from sal_history ;
select * from mgr_history ;

-------------------conditional insert all-------------------------------
truncate table sal_history ;

truncate table mgr_history ;

INSERT ALL
when empid >= 7521 then
INTO sal_history VALUES(EMPID,HIREDATE,SAL)
when mgr >= 7839 then
INTO mgr_history VALUES(EMPID,MGR,SAL)
SELECT empno EMPID, HIREDATE, SAL, MGR
FROM emp
WHERE empno < 7654 ;

commit ;
註意： when語句裏面只能使用pseudocolumn

--------------------conditional FIRST INSERT-----------------------

查詢得到的語句，如果滿足第一個條件，則執行對應的第一個動作，而後面將不再考慮已經處理過的返回行。
INSERT first
when empid < 7654 then
INTO sal_history VALUES(EMPID,HIREDATE,SAL)
when empid = 7499 then
INTO sal_history VALUES(EMPID,HIREDATE,SAL)
else
into mgr_history values(EMPID,MGR,SAL)
SELECT empno EMPID, HIREDATE, SAL, MGR
FROM emp
WHERE empno < 7654 ;

如果有一部分返回行不滿足第一個語句的條件，該部分會被當作條件插入處理。
INSERT first
when empid > 7654 then
INTO sal_history VALUES(EMPID,HIREDATE,SAL)
when mgr = 7499 then
INTO sal_history VALUES(EMPID,HIREDATE,SAL)
else
into mgr_history values(EMPID,MGR,SAL)
SELECT empno EMPID, HIREDATE, SAL, MGR
FROM emp
WHERE empno < 7654 ;

oracle的多表插入學習筆記