Oracle10g 单行子查询在过程中返回多行

下面的过程引发异常

单行子查询返回多行

在sql上执行query>query时执行fine并显示结果 果然

create or replace procedure discount_purchase(cust_name customer1.cust_name%type)
as
    amt int;
    discount int;
begin
    select sum(purch_amt) into amt
    from orders
    where customer_id=(select customer_id from customer1 where cust_name=cust_name);
    dbms_output.put_line('Total amount is='||amt);

    if(amt>=500) then
        discount:=amt-(0.25*amt);
        dbms_output.put_line('Discount amount is='||discount);
    else
        dbms_output.put_line('NO Discount on='||amt||'Discount only above 500');
    end if;
end;
/

SQL>exec折扣购买（“Nick Rimando”）

---

问题在于

customer1

表中有多个客户的

cust\u name

为

'Nick Rimando'

。看看

select count(1)
from customer1
where cust_name = 'Nick Rimando';

我打赌它将导致一个大于1的数字

修复程序

修复取决于您实际需要的内容。实际上你没有写你需要的东西。所以，我想到了一些案例

案例1-使用该名称的所有客户的购买总额

create or replace procedure discount_purchase(cust_name customer1.cust_name%type)
as
    amt int;
    discount int;
begin
    select sum(purch_amt) into amt
    from orders
    where customer_id in (select customer_id from customer1 where cust_name=cust_name);
    dbms_output.put_line('Total amount is='||amt);

    if(amt>=500) then
        discount:=amt-(0.25*amt);
        dbms_output.put_line('Discount amount is='||discount);
    else
        dbms_output.put_line('NO Discount on='||amt||'Discount only above 500');
    end if;
end;
/

create or replace procedure discount_purchase(cust_name customer1.cust_name%type)
as
    amt int;
    discount int;
begin
    select sum(purch_amt) into amt
    from orders
    where customer_id = (select customer_id from customer1 where cust_name=cust_name and rownum <= 1);
    dbms_output.put_line('Total amount is='||amt);

    if(amt>=500) then
        discount:=amt-(0.25*amt);
        dbms_output.put_line('Discount amount is='||discount);
    else
        dbms_output.put_line('NO Discount on='||amt||'Discount only above 500');
    end if;
end;
/

create or replace procedure discount_purchase(cust_name customer1.cust_name%type)
as
    amt int;
    discount int;
begin
    select sum(purch_amt) into amt
    from orders
    where customer_id = (select min(customer_id) from customer1 where cust_name=cust_name);
    dbms_output.put_line('Total amount is='||amt);

    if(amt>=500) then
        discount:=amt-(0.25*amt);
        dbms_output.put_line('Discount amount is='||discount);
    else
        dbms_output.put_line('NO Discount on='||amt||'Discount only above 500');
    end if;
end;
/

案例2-具有该名称的任意单个客户的购买总额

create or replace procedure discount_purchase(cust_name customer1.cust_name%type)
as
    amt int;
    discount int;
begin
    select sum(purch_amt) into amt
    from orders
    where customer_id in (select customer_id from customer1 where cust_name=cust_name);
    dbms_output.put_line('Total amount is='||amt);

    if(amt>=500) then
        discount:=amt-(0.25*amt);
        dbms_output.put_line('Discount amount is='||discount);
    else
        dbms_output.put_line('NO Discount on='||amt||'Discount only above 500');
    end if;
end;
/

create or replace procedure discount_purchase(cust_name customer1.cust_name%type)
as
    amt int;
    discount int;
begin
    select sum(purch_amt) into amt
    from orders
    where customer_id = (select customer_id from customer1 where cust_name=cust_name and rownum <= 1);
    dbms_output.put_line('Total amount is='||amt);

    if(amt>=500) then
        discount:=amt-(0.25*amt);
        dbms_output.put_line('Discount amount is='||discount);
    else
        dbms_output.put_line('NO Discount on='||amt||'Discount only above 500');
    end if;
end;
/

create or replace procedure discount_purchase(cust_name customer1.cust_name%type)
as
    amt int;
    discount int;
begin
    select sum(purch_amt) into amt
    from orders
    where customer_id = (select min(customer_id) from customer1 where cust_name=cust_name);
    dbms_output.put_line('Total amount is='||amt);

    if(amt>=500) then
        discount:=amt-(0.25*amt);
        dbms_output.put_line('Discount amount is='||discount);
    else
        dbms_output.put_line('NO Discount on='||amt||'Discount only above 500');
    end if;
end;
/

案例4-你选择，你实施

我不能告诉你怎么做，这完全取决于你和你的设计考虑

案例5-修复数据模型

---

同样，我无法告诉您如何操作，这完全取决于您和您的设计考虑。

使用别名并获取子查询的第一行sub query返回单值3002 as customer\u id尝试将和rownum=1添加到子查询条件中，如果您不关心列表中的值或确保它们相同，请参阅