Question

我在Mysql中有客户的销售表

+-----------+------------+-------+-----------------+
| Customer  |    Date    | Sales | Date_First_Sale |
+-----------+------------+-------+-----------------+
| Jane      | 2016-04-30 |   903 | 2015-02-03      |
| Jane      | 2016-02-03 |    51 | 2015-02-03      |
| Jane      | 2016-03-09 |   192 | 2015-02-03      |
| John      | 2016-05-10 |    64 | 2015-10-03      |
| John      | 2016-04-16 |   880 | 2015-10-03      |
| John      | 2016-08-17 |   386 | 2015-10-03      |
| John      | 2016-03-01 |   503 | 2015-10-03      |
| Juan      | 2016-07-06 |   765 | 2015-09-01      |
| Juan      | 2016-01-20 |    36 | 2015-09-01      |
| Juan      | 2016-03-03 |   928 | 2015-09-01      |
| Momo      | 2016-06-29 |   573 | 2015-09-01      |
| Momo      | 2016-04-25 |   375 | 2015-09-01      |
| Momo      | 2016-06-10 |   999 | 2015-09-01      |
| Nour      | 2016-02-28 |   956 | 2015-05-01      |
| Nour      | 2016-01-03 |   582 | 2015-05-01      |
| Nour      | 2016-08-17 |   366 | 2015-05-01      |
| Philip    | 2016-03-22 |   296 | 2015-09-01      |
| Philip    | 2016-04-14 |   459 | 2015-09-01      |
| Sylvie    | 2016-03-29 |   551 | 2015-09-03      |
| Sylvie    | 2016-02-14 |   896 | 2015-09-03      |
+-----------+------------+-------+-----------------+

我需要计算过去12个月内每周计算的平均销售额（52或53周，具体取决于日历？），从今天开始计算。

现在的问题是，我不想计算客户在12个月以下的首次购买时的平均每周销售额，例如当前日期是2016-09-01，而客户是他在2016-07-24的首次购买，平均值不应按12个月计算，而应仅按2016-07-24与2016-09-01之间的每周销售额计算。

对于在12个月之前进行首次购买的客户，平均值应仅在12个月内计算。

我一直试图找到这个SELECT，但由于我对更复杂的查询有限的Mysql知识而没有达到任何目的！

提前感谢您的帮助

Answer 1

这应该可以帮到你

SELECT Customer, (total_sales/weeks) AS avg_sales FROM
(
SELECT Customer, total_sales, Date_First_Sale, IF(weeks>52,52,weeks) as weeks
FROM (
    SELECT Customer, SUM(Sales) AS total_sales, Date_First_Sale, TIMESTAMPDIFF(WEEK, Date_First_Sale, CURDATE()) AS weeks
    FROM (
        SELECT Customer, sales , Date_First_Sale
        FROM test.SO_customer
        WHERE Date > DATE_SUB(curdate(), INTERVAL 1 YEAR)
         ) as subTable
    GROUP BY Customer
    ) as subTable2
) as subTable3

选择按客户计算销售平均值将首次销售纳入帐户MYSQL

1 个答案: