Question

我无法克服此错误。我正在使用SQL Server 2017（v14）：

无法绑定多部分标识符“ PS_FFC.Date”。不能绑定多部分标识符“ PS_FFC.Date：”。不能绑定多部分标识符“ PS_FFC.Employee ID”。

代码：

SELECT 
    [Employee ID],
    (SELECT SUM(Total) AS Expr1
     FROM dbo.PS_FFC
     WHERE (PS_FFC.Date >= DATEADD(DAY, 1, EOMONTH(GETDATE(), - 1)))
       AND (PS_FFC.Date < GETDATE())
     GROUP BY PS_FFC.[Employee ID]) AS Current_Month_FFCs,
    (SELECT SUM(Total) AS Expr2
     FROM dbo.PS_FFC AS PS_FFC_2
     WHERE (PS_FFC.Date >= DATEADD(DAY, 1, EOMONTH(GETDATE(), - 2))) 
       AND (PS_FFC.Date < EOMONTH(GETDATE(), - 1))
     GROUP BY PS_FFC.[Employee ID]) AS Prior_Month_FFCs
FROM 
    dbo.PS_FFC AS PS_FFC_1

我要从中提取的表如下：

Employee ID|    Date|         FFC
Emp000          1/1/2019      1
Emp000          1/2/2019      2
Emp000          12/31/2019    1
Emp001          1/3/2019      1
Emp003          1/20/2019     2
Emp004          2/5/2019      4

我希望结果看起来像这样：

Employee ID|    Current_Month_FFCs|    Prior_Month_FFCs
Emp000          0                      3
Emp001          0                      1  
Emp003          0                      2
Emp004          4                      0

Answer 1

您的第二个子查询对表使用别名PS_FFC_2，而您引用的是PS_FFC。好处是您不需要子查询，而只需使用CASE表达式仅聚合所需的行即可。

SELECT PS_FFC.[Employee ID],
    SUM( CASE WHEN PS_FFC.Date >= DATEADD(DAY, 1, EOMONTH(GETDATE(), - 1)) AND PS_FFC.Date < GETDATE()
                    THEN PS_FFC.Total ELSE 0 END) AS Current_Month_FFCs,
    SUM( CASE WHEN PS_FFC.Date >= DATEADD(DAY, 1, EOMONTH(GETDATE(), - 2)) AND PS_FFC.Date < DATEADD(DAY, 1, EOMONTH(GETDATE(), - 1))
                    THEN PS_FFC.Total ELSE 0 END) AS Prior_Month_FFCs
FROM  dbo.PS_FFC AS PS_FFC
WHERE  PS_FFC.Date >= DATEADD(DAY, 1, EOMONTH(GETDATE(), - 2)) 
AND PS_FFC.Date < GETDATE()
GROUP BY Employee_ID;

Answer 2

在第二个子查询中，您将PS_FFC别名为PS_FFC_2。要解决它的列，请使用别名例如PS_FFC_2.Date不是原始名称（例如PS_FFC.Date）。或不要为表添加别名。

Answer 3

一旦为表加上别名，就必须使用别名。您在第二个子查询中没有这样做：

                     (SELECT        SUM(Total) AS Expr2
                       FROM            dbo.PS_FFC AS PS_FFC_2
                       WHERE        (PS_FFC.Date >= DATEADD(DAY, 1, EOMONTH(GETDATE(), - 2))) AND (PS_FFC.Date < EOMONTH(GETDATE(), - 1))
                       GROUP BY PS_FFC.[Employee ID]) AS Prior_Month_FFCs

应为：

                     (SELECT        SUM(Total) AS Expr2
                       FROM            dbo.PS_FFC AS PS_FFC_2
                       WHERE        (PS_FFC_2.Date >= DATEADD(DAY, 1, EOMONTH(GETDATE(), - 2))) AND (PS_FFC_2.Date < EOMONTH(GETDATE(), - 1))
                       GROUP BY PS_FFC_2.[Employee ID]) AS Prior_Month_FFCs

多部分标识符不能绑定

3 个答案: