如果至少满足一次条件，则将值插入表中

Question

我创建了以下DataModel：

表客户

INSERT INTO test.customer
(CustomerName, CustomerCountry, RegistrationDate)
VALUES 
("Customer A","DE","2015-05-03"),
("Customer B","US","2015-07-25"), 
("Customer C","US","2016-02-15"), 
("Customer D","DE","2017-09-21"), 
("Customer E","AU","2018-12-07");

表订单

INSERT INTO test.orders
(idCustomer, PaymentMethod, OrderDate)
VALUES 
("1","CreditCard","2015-05-04"),
("1","PayPal","2015-11-18"), 
("3","PayPal","2017-09-04"), 
("2","Invoice","2018-04-30");

到目前为止，所有这些都工作正常。

---

现在，我想根据SpecialCustomers条件用表Customer和Orders中的值填充表WHERE。因此，我尝试了以下代码：

INSERT INTO test.specialcustomers
(idCustomer, CustomerName)
SELECT idCustomer, CustomerName
FROM test.customer
LEFT JOIN test.orders ON test.customer.idCustomer = test.orders.idCustomer
WHERE PaymentMethod ="PayPal";

这会导致错误：

Error Code: 1052. Column 'idCustomer' in field list is ambiguous

据我所知，问题是Customer A的{​​{1}}和Paypal都具有顺序，因此分配给CreditCard的{​​{1}}是不是唯一的。

但是，我的目标是在满足至少一次条件的情况下，将每个客户插入表PaymentMethod中。
因此，在上述情况下-如果至少用Customer A付款，则应该将客户插入表SpecialCustomers。

要使此功能生效，我需要更改什么代码？

Answer 1

我认为您只是在选择中缺少别名：

INSERT INTO test.specialcustomers (idCustomer, CustomerName)
SELECT c.idCustomer, c.CustomerName
FROM test.customer c
LEFT JOIN test.orders o
    ON c.idCustomer = o.idCustomer
WHERE o.PaymentMethod = 'PayPal';

Answer 2

您必须在插入列和select语句（如果模棱两可）中指定全限定名。提示：在您的from子句中使用别名

Answer 3

在这里，您只需要指定要插入的IdCustomer，就像完成left join一样，我认为它是来自表customer的IdCustomer：

INSERT INTO test.specialcustomers
 (idCustomer, CustomerName)
SELECT c.idCustomer, c.CustomerName
FROM test.customer c
 LEFT JOIN test.orders o ON tc.idCustomer = o.idCustomer
WHERE o.PaymentMethod ="PayPal";

Answer 4

在两个表中都

from tkinter import * def printSomething(): inputValue=textBox.get("1.0","end-1c") res=response(inputValue) label = Label(root, text=res) #this creates a new label to the GUI label.pack() root = Tk() button = Button(root, text="Print Me", command=printSomething) button.pack() textBox=Text(root, height=2, width=10) textBox.pack() root.mainloop() 列，因此在选择查询中添加表名。

idCustomer