Question

我希望得到每个客户大部分订购的前2项。我可以从销售表中获取以下数据

 -----------------------------------------
 |OrderAccount| Item        |  OrderDate  |
 |ABC         | Shoes #1    |  10.01.2016 |
 |ABC         | Shoes #2    |  10.01.2016 |
 |ABC         | Shoes #2    |  13.02.2016 |
 |ABC         | Shoes #1    |  12.12.2016 |
 |ABC         | Shoes #4    |  09.01.2016 |
 |RDD         | Shoes #1    |  01.21.2016 |
 |RDD         | Shoes #2    |  01.22.2016 |
 |RDD         | Shoes #1    |  03.01.2016 |
 |RDD         | Shoes #6    |  03.11.2016 |
 |RDD         | Shoes #1    |  03.21.2016 |
 -----------------------------------------

我使用下面提到的in earlier post查询。

SELECT b.OrderAccount, b.Item
FROM(
    SELECT *, RANK() OVER(PARTITION BY a.OrderAccount ORDER BY a.count_item DESC) AS RowRank
    FROM(
        SELECT so.OrderAccount, so.Item, count(item) count_item
        FROM SalesOrders so
        GROUP BY so.OrderAccount, so.Item
    ) a
) b
WHERE b.RowRank <= 2

我希望从数据中获得更多信息：此项目将出现在下一个销售订单中的可能性是什么（即该项目为此客户显示的销售订单的百分比）我可以从查询中获取此信息吗？

Answer 1

根据您问题中的数据，每一行似乎都是一个单独的订单。所以，我认为你可以做到：

SELECT so.OrderAccount, so.Item,
       (count_item * 1.0 / num_orders) as proportion_of_orders
FROM (SELECT so.OrderAccount, so.Item, count(item) as count_item,
             SUM(COUNT(*)) OVER (PARTITION BY so.OrderAccount) as num_orders,
             RANK() OVER (PARTITION BY so.OrderAccount ORDER BY COUNT(*) DESC) as rnk
      FROM SalesOrders so
      GROUP BY so.OrderAccount, so.Item
     ) so
WHERE rnk <= 2;

Answer 2

我就这样做了：

SELECT a.OrderAccount, a.Item, a.Occurrence, b.SalesOrdersPerAccount, 
         CAST(CAST(a.Occurrence AS decimal)/CAST(b.SalesOrdersPerAccount AS decimal)*100 AS  decimal(16,2)) AS Percentage 
FROM
(
   SELECT so.OrderAccount, so.Item, COUNT(*) AS Occurrence FROM SalesOrders so
   WHERE so.Item IS NOT NULL 
   GROUP BY so.OrderAccount, so.Item
) a

LEFT OUTER JOIN
(
   SELECT so.OrderAccount, COUNT(*) AS SalesOrdersPerAccount FROM SalesOrders so
   WHERE so.Item IS NOT NULL
   GROUP so.OrderAccount
) b ON a.OrderAccount = b.OrderAccount

WHERE b.SalesOrdersPerAccount IS NOT NULL 
ORDER BY a.OrderAccount, Percentage DESC

有机会重复频繁出现的值对

2 个答案: