create table stock
(icode varchar2(20) primary key,
idescrip varchar2(50),
pqty number(4)
);create table input
(iid varchar2(20),
icode varchar2(20),
idescrip varchar2(50),
pqty number(4),
idate date,
constraint input_pk primary key(iid,icode)
);create table sales
(sid varchar2(20),
icode varchar2(20),
idescrip varchar2(50),
pqty number(4),
sdate date,
constraint sales_pk primary key(sid,icode)
);create table return
(rid varchar2(20),
icode varchar2(20),
idescrip varchar2(50),
pqty number(4),
rdate date,
constraint return_pk primary key(rid,icode)
);3、 建立input表和sales表的觸發器，當進貨和銷售產品時，系統自動增、減stock庫存表的icode的數量。
create or replace trigger input
before insert
on input
for each row
declare
cursor c1 is select * from stock where icode=:new.icode for update;
v_stock stock%rowtype;
begin
open c1;
fetch c1 into v_stock;
if(c1%found) then
update stock set pqty=pqty+:new.pqty where current of c1;
else
insert into stock(icode,pqty,idescrip) values(:new.icode,:new.pqty,:new.idescrip);
end if;
close c1;
end;
--測試
insert into input(iid,icode,idescrip,pqty,idate) values('001','a1','aaaaa',100,sysdate);
insert into input(iid,icode,idescrip,pqty,idate) values('005','a1','aaaaa',100,sysdate);
insert into input(iid,icode,idescrip,pqty,idate) values('003','a1','aaaaa',100,sysdate);
insert into input(iid,icode,idescrip,pqty,idate) values('004','a2','aaaaa',100,sysdate);
--insert into sales(sid,icode,idescrip,pqty,sdate) values('001','a1','aaaaa',200,sysdate);
insert into sales(sid,icode,idescrip,pqty,sdate) values('002','a1','aaaaa',200,sysdate);
insert into sales(sid,icode,idescrip,pqty,sdate) values('003','a1','aaaaa',100,sysdate);
insert into sales(sid,icode,idescrip,pqty,sdate) values('004','a1','aaaaa',100,sysdate);
insert into sales(sid,icode,idescrip,pqty,sdate) values('004','a2','aaaaa',10,sysdate);
insert into sales(sid,icode,idescrip,pqty,sdate) values('004','a1','aaaaa',10,sysdate);
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