SQL 具体查询更正

Question

谁能告诉我，这个查询有什么问题，我是使用 Oracle APEX 的学生。我收到此错误：ORA-00918：列定义不明确

SELECT t.BandDesc, TypeDesc, CustomerID, PaymentAmount, TotalPayment FROM

(SELECT Room_Dim.BandDesc, Room_Dim.TypeDesc, CustomerID, PaymentAmount
FROM Room_Dim, Fact_Bookings_Payments
WHERE Room_Dim.RoomID = Fact_Bookings_Payments.RoomID)t 

LEFT JOIN 

(SELECT ConcertID, CustomerID, TotalPayment
FROM Fact_Buy)t2

ON t.CustomerID = t2.CustomerID;

我需要找到：对于每个房间乐队和音乐会，产生 4 星 TypeDesc 房间的累计收入

Answer 1

t 和 t2 都有一个 CustomerId 并且您在连接条件中使用它；但是，在第一行你 select CustomerId 没有指定它来自哪个 table。这可能是错误的来源。

SELECT t.BandDesc,
       TypeDesc,
       t.CustomerID,        -- Either this
       t2.CustomerID,       -- Or this
       PaymentAmount,
       TotalPayment
FROM   (
  SELECT Room_Dim.BandDesc,
         Room_Dim.TypeDesc,
         CustomerID,
         PaymentAmount
  FROM   Room_Dim
         INNER JOIN Fact_Bookings_Payments
         ON Room_Dim.RoomID = Fact_Bookings_Payments.RoomID
) t 
LEFT JOIN (
  SELECT ConcertID, CustomerID, TotalPayment
  FROM Fact_Buy
) t2
ON t.CustomerID = t2.CustomerID;

SQL 具体查询更正

SQL specific Query Correction

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oracle-apex