我正在尝试列出与任何员工不在同一州(或地区)的所有美国客户的公司名称。它应该返回 10 行。我为此使用了以下查询
SELECT Customers.CompanyName
FROM Customers
WHERE Customers.Country='USA'
AND Customers.Region IN
(SELECT Customers.Region
FROM Customers
GROUP BY Customers.Region HAVING COUNT(Customers.Region)=1);
但它只返回 6。
数据库是北风。**公司名
here is the output
Old World Delicatessen
Let's Stop N Shop
Save-a-lot Markets
The Cracker Box
Rattlesnake Canyon Grocery
Split Rail Beer & Ale**