mysql 使用 sum 和 max 查找最高支付的发票

Question

我试图弄清楚如何从表中获取值的总和的 MAX 结果，以显示收据的最高支付金额。我也应该使用子选择，但我很困惑。 到目前为止，这个查询让我得到了我需要显示的所有内容，除了最大值。 This is the table (invoice+OD) need to be used This is what i am currently gettingThis is what i should be getting

我可以在哪里添加 MAX()（总和）？

SELECT invoicenumber invoice
     , invoicedate date
     , SUM(orderqty*ordersell) AS 'Invoice Total' 
  FROM invoice 
  JOIN orderdetail 
    ON invoice.invoiceid = orderdetail.invoiceid 
 GROUP 
    BY invoice ;

Answer 1

如果在 SELECT 中使用 SUM 或 MAX，则需要 GROUP BY 其他列：

SELECT invoicenumber AS invoice
 , invoicedate AS date
 , SUM(orderqty*ordersell) AS 'Invoice Total' 
FROM invoice 
JOIN orderdetail ON invoice.invoiceid = orderdetail.invoiceid 
GROUP BY invoicenumber,invoicedate;

Answer 2

你可以试试这个（添加到上一个答案）：

SELECT invoicenumber AS invoice
 , invoicedate AS date
 , SUM(orderqty*ordersell) AS 'Invoice Total' 
FROM invoice 
JOIN orderdetail ON invoice.invoiceid = orderdetail.invoiceid 
GROUP BY invoicenumber,invoicedate ORDER BY `Invoice Total` DESC LIMIT 1;

可能效率不高，但只返回最高的结果。

Answer 3

我不知道这是否与您所看到的相近，但我认为这会起作用（如果我正确理解您想要实现的目标）。

SELECT inv.invoicenumber,
       inv.invoice, 
       inv.invoicedate AS 'Date',
       MAX((SELECT ord.orderqty+ord.ordersell FROM DUAL)) AS 'Invoice Total' 
  FROM invoice inv
  JOIN orderdetail ord
    ON inv.invoice.invoiceid = ord.orderdetail.invoiceid 
 GROUP BY inv.invoice, 
          inv.invoice, 
          inv.invoicedate;