标识符错误的麻烦答案

【问题标题】：Trouble With Identifier Error标识符错误的麻烦
【发布时间】：2014-05-04 23:41:42
【问题描述】：

我需要列出 2013 年 1 月 26 日或之前所有订单的订单 ID、订单日期、客户 ID、客户名字、客户姓氏和客户电话号码。按订单日期排序，然后按客户 ID 排序，均按升序排列。将日期格式化为“mm-dd-yyyy”并使用以下列标题：OrderID、OrderDate、CustID、CustFirstName、CustLastName、CustPhone。

但我收到一条错误消息“ORD.”CUST_ID”：标识符无效

这是我的代码

 SELECT ORD.Order_ID as OrderID, to_char(Order_Date,'mm-dd-yyyy') as OrderDate, C.Cust_ID as 
 CustID, Cust_FName as CustFirstName, Cust_LName as CustLastName, Cust_Phone as CustPhone
 FROM ORDER_arb ORD, CUSTOMER_arb C
 INNER JOIN ORDER_arb ON C.Cust_ID = ORD.Cust_ID
 WHERE Order_Date <= '26-JAN-13'
 ORDER BY Order_Date, Cust_ID;

感谢您的帮助，谢谢

【问题讨论】：

Oracle...我很抱歉让 MySQL 成为标签。

标签： sql oracle

【解决方案1】：

您正在混合隐式和显式 join 语法。我认为问题在于您在FROM 子句中有两次ORDER_ARB 表。试试这个：

SELECT ORD.Order_ID as OrderID, to_char(ORD.Order_Date, 'mm-dd-yyyy') as OrderDate,
       C.Cust_ID as CustID, C.Cust_FName as CustFirstName, C.Cust_LName as CustLastName,
       C.Cust_Phone as CustPhone
FROM CUSTOMER_arb C INNER JOIN
     ORDER_arb ORD
     ON C.Cust_ID = ORD.Cust_ID
WHERE ORD.Order_Date <= '26-JAN-13'
ORDER BY ORD.Order_Date, C.Cust_ID;

【讨论】：

好主意-但我仍然在 Cust_ID 下收到“列不明确定义”错误

【解决方案2】：

您的查询中的问题似乎在这里

 FROM ORDER_arb ORD, CUSTOMER_arb C   INNER JOIN 
   ORDER_arb    -- no alias here 
      ON C.Cust_ID = ORD.Cust_ID ---   here you have given ORD as alias

为 ORDER_arb 表提供不同的别名并尝试

这可能对你有帮助，

SELECT ORD.Order_ID as OrderID, to_char(Order_Date,'mm-dd-yyyy') as OrderDate, C.Cust_ID as 
CustID, Cust_FName as CustFirstName, Cust_LName as CustLastName, Cust_Phone as      CustPhone
FROM ORDER_arb ORD, CUSTOMER_arb C
INNER JOIN 
ORDER_arb  OR_AB ON C.Cust_ID = OR_AB.Cust_ID
 WHERE Order_Date <= '26-JAN-13'
  ORDER BY Order_Date, Cust_ID;

【讨论】：