mysql - MySQL 根据 SUM 和 GROUP BY 计算年份之间的销售额百分比变化
问题描述
我有一个数据仓库,其中 SELECT(和 SUM)查询具有以下输出。
+------+-----------+-------------+------------+
| YEAR | ITEM TYPE | TOTAL_ITEMS | TOTAL_COST |
+------+-----------+-------------+------------+
| 2009 | TYPE-1 | 19 | 330 |
| 2009 | TYPE-2 | 1 | 10 |
| 2009 | TYPE-3 | 11 | 190 |
| 2010 | TYPE-1 | 11 | 220 |
| 2010 | TYPE-2 | 7 | 230 |
| 2010 | TYPE-3 | 3 | 360 |
+------+-----------+-------------+------------+
我的问题是如何创建一个新列,以百分比计算 2009 年和 2010 年(以 2009 年为基础)之间的总成本差异。
所以输出将是这样的:
+------+-----------+-------------+------------+----------+----------+
| YEAR | ITEM TYPE | TOTAL_ITEMS | TOTAL_COST | ItemDiff | CostDiff |
+------+-----------+-------------+------------+----------+----------+
| 2009 | TYPE-1 | 19 | 330 | 0% | 0 |
| 2009 | TYPE-2 | 1 | 10 | 0% | 0 |
| 2009 | TYPE-3 | 11 | 190 | 0% | 0 |
| 2010 | TYPE-1 | 11 | 220 | -42.11% | -33.33% |
| 2010 | TYPE-2 | 7 | 230 | 1000% | 2200% |
| 2010 | TYPE-3 | 3 | 360 | -72.73% | 80.47% |
+------+-----------+-------------+------------+----------+----------+
ITEM TYPE 是一个由几个不同价格的项目组成的类别。我需要计算每个类别而不是每个项目的变化。
到目前为止我的查询是
SELECT
date_dim.year,
item_dim.item_type,
SUM(fact.total_item)TotalItems,
SUM(fact.total_cost) AS TotalCost
FROM fact
INNER JOIN date_dim
ON fact.date_key = date_dim.date_key
INNER JOIN item_dim
ON fact.item_key = item_dim.item_key
WHERE date_dim.year BETWEEN 2009 AND 2011
GROUP BY date_dim.year,
item_dim.item_type
请查看以下已构建架构和查询的小提琴。
这是简化的 ERD...
预先感谢您的任何帮助...
解决方案
这是一个查询如何实现这一点:
使用 MySQL 公用表表达式(这不在 sqlfiddle 上运行)
WITH summary_table AS
(SELECT
substr(date_dim.year,1,4) year,
item_dim.item_type,
SUM(fact.total_item) TotalItems,
SUM(fact.total_cost) AS TotalCost
FROM fact
INNER JOIN date_dim
ON fact.date_key = date_dim.date_key
INNER JOIN item_dim
ON fact.item_key = item_dim.item_key
WHERE date_dim.year BETWEEN 2009 AND 2011
GROUP BY date_dim.year,
item_dim.item_type)
SELECT
A.*,
CASE WHEN (A.TotalItems IS NULL OR B.TotalItems IS NULL OR B.TotalItems=0) THEN 0 ELSE
(A.TotalItems - B.TotalItems)*100/B.TotalItems END AS ItemDiff,
CASE WHEN (A.TotalCost IS NULL OR B.TotalCost IS NULL OR B.TotalCost=0) THEN 0 ELSE
(A.TotalCost - B.TotalCost)*100/B.TotalCost END AS CostDiff
FROM summary_table A LEFT JOIN summary_table B
ON A.YEAR=(B.YEAR+1) AND A.ITEM_TYPE=B.ITEM_TYPE;
没有 CTE(参见SQL Fiddle 上的演示)
SELECT
A.*,
CASE WHEN (A.TotalItems IS NULL OR B.TotalItems IS NULL OR B.TotalItems=0) THEN 0 ELSE
(A.TotalItems - B.TotalItems)*100/B.TotalItems END AS ItemDiff,
CASE WHEN (A.TotalCost IS NULL OR B.TotalCost IS NULL OR B.TotalCost=0) THEN 0 ELSE
(A.TotalCost - B.TotalCost)*100/B.TotalCost END AS CostDiff
FROM (SELECT
substr(date_dim.year,1,4) year,
item_dim.item_type,
SUM(fact.total_item)TotalItems,
SUM(fact.total_cost) AS TotalCost
FROM fact
INNER JOIN date_dim
ON fact.date_key = date_dim.date_key
INNER JOIN item_dim
ON fact.item_key = item_dim.item_key
WHERE date_dim.year BETWEEN 2009 AND 2011
GROUP BY date_dim.year,
item_dim.item_type) A LEFT JOIN (SELECT
substr(date_dim.year,1,4) year,
item_dim.item_type,
SUM(fact.total_item)TotalItems,
SUM(fact.total_cost) AS TotalCost
FROM fact
INNER JOIN date_dim
ON fact.date_key = date_dim.date_key
INNER JOIN item_dim
ON fact.item_key = item_dim.item_key
WHERE date_dim.year BETWEEN 2009 AND 2011
GROUP BY date_dim.year,
item_dim.item_type) B
ON A.YEAR=(B.YEAR+1) AND A.ITEM_TYPE=B.ITEM_TYPE;
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