mysql - MYSQL 编码中的 INTERSECT 不起作用

Question

我有一个名为 Orders 的表，其中包含 CUSTNUM、PRODNUM、DATE 和 QTY 列。

我正在尝试检索同时订购产品 3737 和产品 9193(特定值)的客户

所以我尝试了以下代码但没有成功:

SELECT CUSTNUM
FROM ORDERS
WHERE PRODNUM = 9193

INTERSECT

(SELECT CUSTNUM
FROM ORDERS
WHERE PRODNUM = 3737);

在进一步阅读此论坛后，我也尝试了以下方法:

SELECT DISTINCT CUSTNUM
FROM ORDERS
WHERE PRODNUM IN (
select PRODNUM FROM ORDERS WHERE PRODNUM = 3737
) AND PRODNUM IN (
Select PRODNUM FROM ORDERS WHERE PRODNUM = 2357
);

尽管我们的教科书中包含了 INTERSECT 运算符，但它似乎不起作用。

我也咨询过INTERSECT in MySQL

Answer 1

MySQL 支持 UNION [ALL]，但不支持 MINUS/EXCEPT 和 INTERSECT。

select    custnum            
from      orders    
where     prodnum in (3737,9193)    
group by  custnum       
having    count(distinct prodnum) = 2

或

select    custnum            
from      orders    
where     prodnum in (3737,9193)    
group by  custnum       
having    min(prodnum) = 3737
      and max(prodnum) = 9193