Question

父表：加载和2个子表：发票＆amp; 付款即可。所有链接在Load_id上。获取每个负载的所有发票和付款的总和。

这给了我错误：[错误] 1054 - 未知栏＆＃39; I.Load_Id＆＃39;在＆＃39; on条款＆＃39;

SELECT L.Load_Id,
I.Invoice_Total,
P.Payment_Total
FROM Loads AS L

LEFT OUTER JOIN
(
SELECT 
SUM(Invoice_Total) AS Invoice_Total
FROM invoices
GROUP BY Load_Id
) AS I
ON I.Load_Id = L.Load_Id

LEFT OUTER JOIN
(
SELECT 
SUM(Amount) AS Payment_Total
FROM Payments
GROUP BY Load_Id
) AS P
ON P.Load_Id = L.Load_Id

这也给了我错误：[Err] 1054 - 未知栏＆＃39; I.Load_Id＆＃39;在＆＃39; on条款＆＃39;

SELECT Loads.Load_Id,
I.Invoice_Total,
P.Payment_Total
FROM Loads 

LEFT JOIN
(
SELECT 
SUM(Invoice_Total) AS Invoice_Total
FROM invoices
GROUP BY Load_Id
) AS I
ON I.Load_Id = Loads.Load_Id

LEFT JOIN
(
SELECT 
SUM(Amount) AS Payment_Total
FROM Payments
GROUP BY Load_Id
) AS P
ON P.Load_Id = Loads.Load_Id

我尝试了很多变化，但显然我没有得到它。

Answer 1

您没有在子查询中选择任何名为Load_Id的字段，而mySQL正在抱怨这一点。你确实已经按照它进行分组，所以只需要在下面的查询中选择它就可以加入它。

SELECT L.Load_Id,
I.Invoice_Total,
P.Payment_Total
FROM Loads AS L

LEFT OUTER JOIN
(
SELECT 
SUM(Invoice_Total) AS Invoice_Total, Load_Id
FROM invoices
GROUP BY Load_Id
) AS I
ON I.Load_Id = L.Load_Id

LEFT OUTER JOIN
(
SELECT 
SUM(Amount) AS Payment_Total, Load_Id
FROM Payments
GROUP BY Load_Id
) AS P
ON P.Load_Id = L.Load_Id

子表总和别名错误

1 个答案: