在 MySQL 中为最后“x”天创建累积循环 SUM

Question

我的业务销售经历了一个非常独特的年度周期，该周期基于全年的季节。我无法了解我每周或每月的成长。我真正需要的是显示过去 365 天的运行总计——每一天。当我跨越一整年时，我真的可以看到我的业务是如何增长的。

下面，我只是编造数据来解释我的愿望。我已经有一个 SQL 查询，它给出了年、周和销售额。这是我的查询（它涉及一些加入，但它有效）：

SELECT
YEAR(arrPurch.PurchaseDate) as YEAR,
Week(arrPurch.PurchaseDate) AS Week,
SUM(ROUND(arrPurch.Credits*1.85+arrPurch.Price,0)) AS `Sales`
FROM
arrangementPurchases AS arrPurch
INNER JOIN catalog_dev_arrangements AS catDEVarr ON arrPurch.ArrangementID = catDEVarr.ArrangementID
INNER JOIN members ON arrPurch.MemberID = members.MemberID
WHERE arrPurch.PurchaseDate >= '2015-01-04'
GROUP BY Year, Week
ORDER BY Year, Week

现在，我需要的是允许我获得第四列“累积年份”的代码，其中考虑到当前周以及所有 51 周的销售额。然后，每周，我都会对我的销售增长状态有一个清晰的认识，因为我知道每周累积会考虑到我年度销售周期中的所有季节。

Year      Week         Sales           Cumulative Year
-------------------------------------------------------
2017       01          24,292          2,467,488
2017       02          32,838          2,471,433
2017       03          33,283          2,470,212

请帮忙:-)

Answer 1

我使用了一个子查询来获取从给定年份一周到 51 周前的销售额总和。请参阅下面的示例演示

http://sqlfiddle.com/#!9/ce6dd0/1

select
YEAR(arrPurch.PurchaseDate) as YEAR,
Week(arrPurch.PurchaseDate) AS Week,
SUM(ROUND(arrPurch.Credits*1.85+arrPurch.Price,0)) AS `Sales`,
(select sum(ROUND(t.Credits*1.85+t.Price,0))
      FROM arrangementPurchases AS t
      INNER JOIN catalog_dev_arrangements AS catDEVarr ON t.ArrangementID = catDEVarr.ArrangementID
      INNER JOIN members ON t.MemberID = members.MemberID
  where YEARWEEK(t.purchaseDate)
  between YEARWEEK(arrPurch.purchaseDate - INTERVAL 51 WEEK) 
 and YEARWEEK(arrPurch.purchaseDate)) as `Cumulative_Year`
FROM arrangementPurchases AS arrPurch
INNER JOIN catalog_dev_arrangements AS catDEVarr ON arrPurch.ArrangementID = catDEVarr.ArrangementID
INNER JOIN members ON arrPurch.MemberID = members.MemberID
WHERE arrPurch.PurchaseDate >= '2015-01-04'
GROUP BY Year, Week
ORDER BY Year, Week