如何用MySQL过滤正确的订单（一个订单包含多行）

Question

我必须过滤没有特定产品的订单。

这很简单，但问题是，每个订单可能有很多行，包含不同的产品。

这是我的数据的一个示例：

ID | Product | Customer  | Quantidy | Date 
1 | Apple | Alex Sorensen | 3  | 17.4.2009 
2 | Orange | Alex Sorensen | 1  | 17.4.2009 
3 | Lime | Alex Sorensen | 4  | 17.4.2009 
4 | Apple | Fred Jonsson | 1  | 30.5.2010 
5 | Lime | Fred Jonsson | 7  | 30.5.2010 
ect... 

线具有相同date和相同customer都为相同的顺序。

如何查找所有订单中没有（例如）Orange的订单？

---

我自己的（不工作）的MySQL代码：

SELECT o.ID, k.Customer, o.Quantidy, p.Product, o.Date 
FROM Products p, Orders o, Customers c 
WHERE p.ID = o.ID 
AND k.Customer = o.Customer 
AND p.Product NOT IN ('Orange') 
GROUP BY o.Date 
ORDER BY o.ID DESC 

的问题是，即使我不想“亚历克斯索伦森的”命令，因为它包含橘子，我得到他其他线路没有包含“橙色”的线路。

我需要一个SQL代码才能给我“Fred Jonsson”和其他订单，它们没有订单中的桔子。

Answer 1

您应该能够使用NOT EXISTS：

SELECT o.ID, c.Customer, o.Quantity, p.Product, o.Date 
FROM Products p, Orders o, Customers c 
WHERE p.product = o.product 
AND c.Customer = o.Customer 
AND NOT EXISTS (SELECT 1 FROM Orders o2 
       WHERE o2.product = 'Orange' 
       AND o2.customer = o.customer 
       AND o2.date = o.date 
       ) 

---

尝试使用明确的方式连接语法，它会使阅读您的查询更容易，一旦你习惯了：

SELECT o.ID, c.Customer, o.Quantity, p.Product, o.Date 
FROM Orders o 
JOIN Products p ON (p.product = o.product) 
JOIN Customers c ON (c.Customer = o.Customer) 
WHERE NOT EXISTS (SELECT 1 FROM Orders o2 
        WHERE o2.product = 'Orange' 
        AND o2.customer = o.customer 
        AND o2.date = o.date 
       ) 

另一种方法是使用一个Left Join和检查NULL：

SELECT o.ID, c.Customer, o.Quantity, p.Product, o.Date 
FROM Orders o 
JOIN Products p ON (p.product = o.product) 
JOIN Customers c ON (c.Customer = o.Customer) 
LEFT JOIN Orders o2 ON ( o2.product = 'Orange' 
         AND o2.customer = o.customer 
         AND o2.date = o.date 
         ) 
WHERE o2.Id IS NULL 

你必须尝试哪一种效果更好。

Answer 2

变化

p.Product NOT IN ('Orange') 

到

k.Customer NOT IN (select DISTINCT Customer from Products where Product= 'Orange') 


SELECT o.ID, k.Customer, o.Quantidy, p.Product, o.Date 
FROM Products p, Orders o, Customers c 
WHERE p.ID = o.ID 
AND k.Customer = o.Customer 
AND k.Customer NOT IN (select DISTINCT Customer from Products where Product= 'Orange') 
GROUP BY o.Date 
ORDER BY o.ID DESC