语法错误mysql（按长度排序）

我在这个特殊的语句中遇到了语法错误，我已经验证了这个语句并检查了错误，但似乎找不到任何错误，也许一双新的眼睛会看到一些东西

SELECT Purchase_Order.Airline_Carrier_Code, 
       Aircraft_Purchased.*, 
       Aircraft.Unit_Price * Aircraft_Purchased.Quantity as Total_Cost 
  FROM Aircraft_Purchased 
 INNER JOIN Purchase_Order ON Aircraft_Purchased.Order_Number = Purchase_Order.Order_Number 
  INNER JOIN Aircraft_Purchased.Aircraft_ID = Aircraft.Aircraft_ID 
ORDER BY (Purchase_Order.Airline_Carrier_Code), Purchase_Order.Airline_Carrier_Code;

我收到的错误代码如下

1064-您的SQL语法有错误；检查与您的MySQL服务器版本对应的手册，以获得正确的语法，以便在第1行使用“.airpair\u ID ORDER BY LENGTH（Purchase\u ORDER.Airline\u Carrier\u Code），Purchase\u Orde”**

---

在第二次

内部联接之后，您缺少
飞机
表引用：

SELECT purchase_order.airline_carrier_code, 
       aircraft_purchased.*, 
       aircraft.unit_price * aircraft_purchased.quantity AS Total_Cost 
FROM   aircraft_purchased 
       INNER JOIN purchase_order 
               ON aircraft_purchased.order_number = purchase_order.order_number 
       INNER JOIN aircraft  <--- here
               ON aircraft_purchased.aircraft_id = aircraft.aircraft_id 
ORDER  BY purchase_order.airline_carrier_code; 

选择采购订单、航空公司、承运人代码，
购买的飞机。*，
飞机。单价*购买的飞机。数量作为总成本
从购买的飞机上
内部联接采购订单
飞机上的采购订单号=采购订单号
内部连接飞机内部连接飞机购买。飞机ID=飞机。飞机ID订购人

内部联接
表名
，以及部分。
谢谢，我知道这很简单