加入两个表并使组和总和正确

Question

几个小时以来一直在努力解决这个问题，非常感谢您的帮助！

所以我有两个表，transactions 和 transactions_rebuy

我的 SELECT 目标是 join/combine 这些表格并按日期对它们进行分组。

现在我有这个声明：

SELECT tr.SoldDate, SUM(tr.TotalAmount) as SumByReceipt,
COUNT(DISTINCT(tr.`ForsNr`)) as TotalCustomers, rebuy.RebuySum
FROM transactions tr   
CROSS JOIN (
SELECT SUM(TotalAmount) as RebuySum
    FROM transactions_rebuy
    WHERE SoldDate BETWEEN '2016-10-22' AND '2016-10-27'
    ) as rebuy
WHERE tr.SoldDate BETWEEN '2016-10-22' AND '2016-10-27' 
GROUP by tr.SoldDate
ORDER by tr.SoldDate DESC

这给了我以下结果：

SaldDatum SumByReceipt TotalCustomers RebuySum

2016-10-27 54855.8001       99        10435.9997
2016-10-26 41749.8009       76        10435.9997
2016-10-25 46626.8001       79        10435.9997
2016-10-24 38678.8017       76        10435.9997
2016-10-22 30351.9997       48        10435.9997

问题是 "RebuySum" 列是对上述所有日期的总和进行分组的。作为 "SumByReceipt"，我希望它按日期分组，而不是每行的总和。

我反复尝试过分组和求和，并且成功了，但后来它弄乱了 "SumByReceipt" 列。

非常感谢对此的想法。

Answer 1

按日期对子查询进行分组，然后在该日期加入它们。

SELECT tr.SoldDate, SUM(tr.TotalAmount) as SumByReceipt,
        COUNT(DISTINCT(tr.`ForsNr`)) as TotalCustomers, IFNULL(rebuy.RebuySum, 0) RebuySum
FROM transactions tr   
LEFT JOIN (
    SELECT SoldDate, SUM(TotalAmount) as RebuySum
    FROM transactions_rebuy
    WHERE SoldDate BETWEEN '2016-10-22' AND '2016-10-27'
    GROUP BY SoldDate
    ) as rebuy
ON tr.SoldDate = rebuy.SoldDate
WHERE tr.SoldDate BETWEEN '2016-10-22' AND '2016-10-27' 
GROUP by tr.SoldDate
ORDER by tr.SoldDate DESC

加入两个表并使组和总和正确

JOINing two tables and make group and sums correct

mysql

sql-server

join

group-by

cross-join