Question

亚马逊为其市场客户提供CSV报告，其中包含有关您销售的每件商品的信息。每篇文章有四行，如下所示：

+----------------------+------------+-------------------+--------+
|       orderid        | amounttype | amountdescription | amount |
+----------------------+------------+-------------------+--------+
| 305-2406165-0572365  | ItemPrice  | Principal         | 2.98   |
| 305-2406165-0572365  | ItemPrice  | Shipping          | 3.89   |
| 305-2406165-0572365  | ItemFees   | Commission        | -0.45  |
| 305-2406165-0572365  | ItemFees   | ShippingHB        | -0.59  |
+----------------------+------------+-------------------+--------+

正如您所看到的，每篇文章都有四行，其中两行是实际售价，两行是我必须支付给亚马逊的费用。

我使用MySQL将此CSV文件导入SQL表。选择包括价格在内的一些数据如下：

SELECT DISTINCT
    report.posteddate AS Date,
    orders.OrderID,
    orders.ExternalOrderID AS AZNr,
    report.amount AS ArtPrice
FROM
    report,
    orders
WHERE
    orders.ExternalOrderID = report.orderid
        AND report.amountdescription = 'Principal'
        AND report.transactiontype = 'Order'
ORDER by Date DESC

为了获得没有发货的商品价格，我选择只获取amountdescription为“Principal”的行。可以忽略transactiontype以解决我的问题。

我想做什么：

我想提取amounttype为“ItemFees”的两个字段，将它们一起添加并将结果显示为单个字段。选择此选项后，行应如下所示：

+------------+---------+---------------------+----------+-------+
|    Date    | OrderID |        AZNr         | ArtPrice | Fees  |
+------------+---------+---------------------+----------+-------+
| 24.07.2014 |  267720 | 305-2406165-0572365 | 2.98     | -1.04 |
+------------+---------+---------------------+----------+-------+

我尝试为两个行运行一个子查询，并选择amounttype =“ItemFees”并合并结果，但最后我发现错误说我的子查询返回多行。这是查询：

SELECT DISTINCT
    report.posteddate AS Date,
    orders.OrderID,
    orders.ExternalOrderID AS AZNr,
    report.amount AS ArtPrice,
    (SELECT 
            SUM(report.amount)
        FROM
            report,
            orders
        WHERE
            orders.ExternalOrderID = report.orderid
                AND report.amountdescription = 'Commission') +
    (SELECT 
            SUM(report.amount)
        FROM
            report,
            orders
        WHERE
            orders.ExternalOrderID = report.orderid
                AND report.amountdescription = 'ShippingHB') AS Fees
FROM
    report,
    orders
WHERE
    orders.ExternalOrderID = report.orderid
        AND report.amountdescription = 'Principal'
        AND report.transactiontype = 'Order'
ORDER by Date DESC

是否有人知道如何使用给定条件从两个不同的行中总结两个值（请参阅WHERE子句）？另外，我需要提取运费值，但我认为这是同一个问题。

提前谢谢。

Answer 1

您可以使用两个查询计算itemprice和itemfees并加入它们

select a.orderid, a.price, b.fees
from (select orderid, sum(amount) price from report where amounttype='ItemPrice' group by orderid) a
     join (select orderid, sum(amount) fees from report where amounttype='ItemFees' group by orderid) b
     on a.orderid = b.orderid

这假设至少有一行有itemprice，一行有itemfees。否则你应该使用外连接。

在条件下组合来自不同行的字段

1 个答案: