Question

我知道之前曾多次被问过，但我似乎遇到了一个奇怪的问题。

我正在尝试收集数据，以图表的形式显示每个货物每月欠款的总和。

我正在尝试将我的查询加入到几个月的临时表中，所以即使那个月没有数据，我仍然会得到图表的值为0.

我的代码：

INSERT INTO #DemurrageValuesExport
        SELECT #Months.Month,
                        SUM(CASE
                            WHEN ISNULL(PD.PotentialDemurrageCost,0) < 0
                            THEN 0
                            ELSE ISNULL(PD.PotentialDemurrageCost,0)
                        END) AS [Potential Demurrage]
        FROM        dbo.Trip
                    RIGHT JOIN dbo.TripCargo
                        ON dbo.Trip.ID = dbo.TripCargo.TripID 
                    RIGHT JOIN dbo.Cargo
                        ON dbo.TripCargo.CargoID = dbo.Cargo.ID
                    LEFT JOIN #Months
                        ON Month = PD.Berthed
                    LEFT JOIN dbo.PotentialDemurrageEvents AS PD
                        ON dbo.Trip.ID = PD.TripID
                        AND PD.Berthed BETWEEN @MonthStartDate AND @MonthEndDate
                        AND dbo.TripCargo.ID = PD.TripCargoID
        WHERE dbo.Cargo.ID = @CargoID AND TripCargo.Export = 1
        GROUP BY    Month

这会循环过去12个月中的每一个，获得特定货物的价值。

问题出现了; ON Month = PD.Berthed

声称PD.Berthed无法受约束。但是，我在查询中的其他位置使用了别名，它们不会导致问题。如果我删除临时表连接，查询执行正常。

有没有人知道发生了什么？或者失败了，实现我想要做的事情而不加入另一个月的桌子呢？

由于

Answer 1

对临时表进行别名肯定会有助于清除问题，但我们还必须更改JOIN的顺序，因为在您尝试加入#Months时，PD 1}}别名尚未引入：

INSERT INTO #DemurrageValuesExport
    SELECT m.Month,
                    SUM(CASE
                        WHEN ISNULL(PD.PotentialDemurrageCost,0) < 0
                        THEN 0
                        ELSE ISNULL(PD.PotentialDemurrageCost,0)
                    END) AS [Potential Demurrage]
    FROM        dbo.Trip
                RIGHT JOIN dbo.TripCargo
                    ON dbo.Trip.ID = dbo.TripCargo.TripID 
                RIGHT JOIN dbo.Cargo
                    ON dbo.TripCargo.CargoID = dbo.Cargo.ID
                LEFT JOIN dbo.PotentialDemurrageEvents AS PD
                    ON dbo.Trip.ID = PD.TripID
                    AND PD.Berthed BETWEEN @MonthStartDate AND @MonthEndDate
                    AND dbo.TripCargo.ID = PD.TripCargoID
                LEFT JOIN #Months m
                    ON m.Month = PD.Berthed
    WHERE dbo.Cargo.ID = @CargoID AND TripCargo.Export = 1
    GROUP BY    m.Month

完全混淆版本：

INSERT INTO #DemurrageValuesExport
    SELECT m.Month,
                    SUM(CASE
                        WHEN ISNULL(PD.PotentialDemurrageCost,0) < 0
                        THEN 0
                        ELSE ISNULL(PD.PotentialDemurrageCost,0)
                    END) AS [Potential Demurrage]
    FROM        dbo.Trip t
                RIGHT JOIN dbo.TripCargo tc
                    ON t.ID = tc.TripID 
                RIGHT JOIN dbo.Cargo c
                    ON tc.CargoID = c.ID
                LEFT JOIN dbo.PotentialDemurrageEvents AS PD
                    ON t.ID = PD.TripID
                    AND PD.Berthed BETWEEN @MonthStartDate AND @MonthEndDate
                    AND tc.ID = PD.TripCargoID
                LEFT JOIN #Months m
                    ON m.Month = PD.Berthed
    WHERE c.ID = @CargoID AND tc.Export = 1
    GROUP BY    m.Month

Answer 2

这是因为您在尝试引用它后加入了表。将连接移动到#Months之后

LEFT JOIN dbo.PotentialDemurrageEvents AS PD
-- ...
LEFT JOIN #Months
       ON Month = PD.Berthed

无法在Temp Table Join上绑定多部分标识符

2 个答案: