指定的字段可以引用 FROM 子句中列出的多个表

Question

我有以下代码。 我的问题是我想从另一个表名称 Employee 中检索每个员工姓名，该表名称具有类似于我在当前查询中使用的 AccessLog 表的 EmployeeID 列。 现在，当我加入这两个表时，它给出了我在标题上所说的奇怪错误。没有添加用于加入的代码 - A.EmployeeID，第一个 SELECT 中的 Employee.FirstName 和 ; 作为内部联接 A.EmployeeID 上的 Employee = Employee.EmployeeID 到最后一个 ORDER By 子句，它运行良好。我认为问题出在命名/别名上。我看到了类似的线程，但这些并没有解决我的问题。如果有人能指出我的错误，将不胜感激。

SELECT **A.EmployeeID,
    Employee.FirstName,**
    MonthName(Month([LogDate])) AS MonthName,
    Round((Sum(Int(DateDiff("s",'00:00:00',Duration)))/3600)) AS TotalTime
    FROM (
         SELECT AccessLog.EmployeeID, 
                AccessLog.LogDate, 
                AccessLog.TerminalID, 
                AccessLog.LogTime, 
                Format((SELECT max(LogTime) 
                        FROM AccessLog AS Alias 
                        WHERE Alias.LogTime < AccessLog.LogTime 
                        AND Alias.EmployeeID = AccessLog.EmployeeID 
                        AND Alias.LogDate = AccessLog.LogDate 
                        AND (Alias.TerminalID)<>"iGuard1A" 
                        And (Alias.TerminalID)<>"iGuard1B"  
                        AND Alias.EmployeeID = AccessLog.EmployeeID),"hh:nn:ss") AS PrevTime, 
                Format((ElapsedTime(iif(PrevTime = '',logtime,prevtime),[LogTime])),"hh:nn:ss") AS Duration, 
                AccessLog.InOut 
             FROM AccessLog 
             WHERE (((AccessLog.TerminalID)<>"iGuard1A" 
             And (AccessLog.TerminalID)<>"iGuard1B") 
             AND ((AccessLog.EmployeeID) Like "2*") 
             AND ((AccessLog.InOut)="OUT")) 
             ORDER BY AccessLog.EmployeeID, AccessLog.LogDate, AccessLog.LogTime)  
             **AS A INNER JOIN Employee ON A.EmployeeID= Employee.EmployeeID**
      GROUP BY EmployeeID, MonthName(Month([LogDate]));

Answer 1

我认为这可能是GROUP BY EmployeeId - 尝试将其更改为GROUP BY A.EmployeeId或GROUP BY Employee.EmployeeId。

编辑：它可能必须GROUP BY A.EmployeeId，因为这是使用SELECT的那个。

Answer 2

我解决了。正如我所说，存在名称/别名问题。我必须为每个子查询中使用的同一表提供单独的别名。即使在那之后，它也在顶部选择中为名字显示另一个加重函数的错误，我也通过将其包含在子查询中来解决这个问题。因此，我的代码完整如下：

SELECT C.EmployeeID, 
   (SELECT Employee.FirstName& ' ' &Employee.LastName 
      FROM Employee 
      where C.EmployeeID= Employee.EmployeeID) 
    AS FullName, 
   MonthName(Month([LogDate])) AS MonthName,
   Round((Sum(Int(DateDiff("s",'00:00:00',Duration)))/3600)) AS TotalTime
   FROM (SELECT B.EmployeeID, 
              B.LogDate, 
              B.TerminalID, 
              B.LogTime, 
              Format((SELECT max(LogTime) 
                      FROM AccessLog AS A 
                      WHERE A.LogTime < B.LogTime 
                      AND A.EmployeeID = B.EmployeeID  
                      AND A.LogDate = B.LogDate 
                      AND (A.TerminalID)<>"iGuard1A" 
                      And (A.TerminalID)<>"iGuard1B"  
                      AND A.EmployeeID = B.EmployeeID),"hh:nn:ss") AS PrevTime,  
              Format((ElapsedTime(iif(PrevTime = '',logtime,prevtime),[LogTime])),"hh:nn:ss") AS Duration, 
              B.InOut 
              FROM AccessLog As B  
              WHERE (((B.TerminalID)<>"iGuard1A" 
               And (B.TerminalID)<>"iGuard1B") 
               AND ((B.EmployeeID) Like "2*") 
               AND ((B.InOut)="OUT")) 
               ORDER BY B.EmployeeID, B.LogDate, B.LogTime)  
AS C INNER JOIN Employee ON C.EmployeeID= Employee.EmployeeID
GROUP BY C.EmployeeID, MonthName(Month([LogDate]));