Join MySQL自引用联接

我有两张桌子：

Customers (
    int(11) Id, 
    varchar(255) Name, 
    int(11) Referred_ID -- Referred_ID being reference to an Id field 
                        -- (no key on that field) and 
)

另一个表格是：

Invoices (
    int(11) Id, 
    date Billing_date, 
    int(11) Customer_ID
)

我想选择发票的Id、开票日期以及最重要的客户名称

现在我只能通过这样的查询来选择他的推荐人的ID：

SELECT Invoices.Id, Invoices.Billing_date, Customers.Name, Referred_ID
    FROM Invoices 
    INNER JOIN Customers ON Invoices.Customer_Id = Customers.Id;

我应该如何修改查询以将引用的\u ID替换为其所有者名称

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顺便说一下，这是一个类似于2015年的MySQL。

在join中使用Customers表两次

 SELECT Invoices.Id, Invoices.Billing_date,
 c1.Name as customername,
c1.Referred_ID,
c2.Name as refername 
FROM Invoices INNER JOIN Customers c1 ON Invoices.Customer_Id = c1.Id
join Customers c2 on  c1.Id=c2.Referred_ID 

---

您可以使用两次使用别名的客户加入所提及的客户

    SELECT Invoices.Id, Invoices.Billing_date, Customers.Name, Referred.Name 
    FROM Invoices 
    INNER JOIN Customers ON Invoices.Customer_Id = Customers.Id
    INNER JOIN Customers Referred on Referred.id =  Customers.Referred_ID;

---

我没有测试它，但我想下面应该适用于您的案例选择Invoices.Id，Invoices.Billing\u date，MainCustomer.Name，RefCustomer.Name FROM Invoices INNER JOIN Customers AS maincuster ON Invoices.Customer_Id=maincuster.Id LEFT JOIN Customers AS RefCustomer ON RefCustomer.Id=maincuster.refered_Id是类似2015的MySQL…-这是MySQL 5.xIn MySQL 5.x，您可以遍历有限数量的引用。如果你想直接转诊，那很容易。如果您需要将初始引用返回到第一个引用，则需要MySQL 8.x递归CTE。@tnsaturday立即检查plz有一个typo@tnsaturday我错过了比赛