Question

我正试图弄清楚如何从表中获得最大的SUM值结果，以便显示收据的最高支付金额。我也应该使用subselect，但是我感到困惑。到目前为止，此查询为我提供了我需要显示的所有信息（最大值除外）。 This is the table (invoice+OD) need to be used This is what i am currently getting This 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

您可以尝试执行此操作（在上一个答案的基础上）：

1.7.0.13.5

效率可能不高，但仅返回最高结果。

Answer 3

我不知道这与您所寻找的内容是否相近，但我认为这会起作用（如果我正确理解了您要实现的目标）。

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;

mysql使用sum和max来查找最高的支付发票

3 个答案: