Question

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

我正在尝试检索订购产品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);

在此论坛上进一步阅读之后，我也尝试了这个：

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INTERSECT运算符包含在我们的教科书中，但似乎无法正常工作。

我也咨询了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

MYSQL编码中的INTERSECT不起作用

1 个答案: