Question

这是我的查询。触发器，自动存储在名为“ExcellentSale”的单独表中的销售代理名称，汽车型号和制造商名称，每次商定的价格 SalesTransaction超过汽车要价的20％。（注意：你需要创建实现此触发器之前的'ExcellentSale'表。要创建主键，请使用从1开始并以1为增量的序列。它显示像这样的错误

ERROR at line 23: PL/SQL: ORA-00942: table or view does not exist
1. create or replace trigger filltable
2. after insert on salestransaction
3. for each row
4. declare

触发器的代码是：

create or replace trigger filltable
after insert on salestransaction
for each row
declare
aname varchar2(25);
modname varchar2(25);
manfname varchar2(25);
askpr number;
agrpr number;
begin
select sa.name,m.name,mf.name
into   aname,modname,manfname
from   manufacturer mf,model m, car c, salestransaction st, salesagent sa
where mf.manufacturerid = m.manufacturerid and
m.modelno = c.modelno and
c.vin = st.vin and
st.agentid = sa.agentid;

select askingprice,agreedprice
into askpr,agrpr
from car c,salestransaction st
where c.VIN = St.vin;

if(agrpr > askpr*1.2) then

insert into excellentsales values(agent_seq.nextval,aname,modname,manfname);

end if;

end filltable;

/


create table excellentsales
(agentid varchar2(5) not null,
agentname varchar2(25),
carmodel varchar2(25),
mfname varchar2(25),
primary key(agentid))

CREATE SEQUENCE agent_seq START WITH 1 INCREMENT BY 1;

Answer 1

您不需要在SALESTRANSACTION的行触发器中查询SALESTRANSACTION - 您应该使用调用触发器的SALESTRANSACTION行上的：NEW值。我建议将你的触发器重写为：

create table excellentsales
(EXCELLENTSALES_ID  NUMBER
   CONSTRAINT PK_EXCELLENTSALES
   PRIMARY KEY
     USING INDEX,
agentid varchar2(5) not null,
agentname varchar2(25),
carmodel varchar2(25),
mfname varchar2(25))

CREATE SEQUENCE EXCELLENTSALES_SEQ
  START WITH 1
  INCREMENT BY 1;

create or replace trigger filltable
  after insert on salestransaction
  for each row
declare
  aname varchar2(25);
  modname varchar2(25);
  manfname varchar2(25);
  askpr number;
  agrpr number;
begin    
  SELECT m.NAME, mf.NAME, c.ASKINGPRICE
    INTO modname, manfname, askpr
    FROM CAR c
    INNER JOIN MODEL m
      ON m.MODELNO = c.MODELNO
    INNER JOIN MANUFACTURER mf
      ON mf.MANUFACTURERID = m.MANUFACTURERID
    WHERE c.VIN = :NEW.VIN;

  SELECT sa.NAME
    INTO aname
    FROM SALESAGENT sa
    WHERE sa.AGENTID = :NEW.AGENTID;

  agrpr := :NEW.AGREEDPRICE;

  if agrpr > askpr * 1.2 then
    insert into excellentsales (EXCELLENTSALES_ID, AGENTID, AGENTNAME, CARMODEL, MFNAME)
      values(EXCELLENTSALES_SEQ.nextval, :NEW.AGENTID, aname, modname, manfname);
  end if;
end filltable;

我还重新设计了您的EXCELLENTSALES表，以包含一个不是AGENTID的主键。最初设计的EXCELLENTSALES没有记录实际的AGENTID（显然应该来自SALESTRANSACTION），在现实世界中可能需要它，例如，支付佣金。

PL / Sql查询执行错误

1 个答案: