Question

问题是“列出每年最畅销的3种产品”

我执行了以下查询

select top 3 b.CalendarYear,c.ProductKey, d.EnglishProductSubcategoryName ,SUM(a.SalesAmount) as SALES
from FactInternetSales as A inner join dimdate as B
on a.OrderDateKey =b.DateKey
inner join DimProduct as c
on c.ProductKey = a.ProductKey
inner join DimProductSubcategory as d
on c.ProductSubcategoryKey = d.ProductSubcategoryKey
inner join  DimProductCategory as e 
on d.ProductCategoryKey=e.ProductCategoryKey
group by b.CalendarYear,c.ProductKey, d.EnglishProductSubcategoryName
order by SALES desc

我得到了以下答案

CalendarYear    ProductKey  EnglishProductSubcategoryName    SALES
2006    312 Road Bikes  658401.68
2006    313 Road Bikes  608305.90
2006    310 Road Bikes  608305.90

我的疑问是，为什么不是所有年份只有“2006年”数据才会出现？

Answer 1

使用以下查询..

   ; WITH cte_1
     AS
     ( SELECT CalendarYear,ProductKey
                      ,EnglishProductSubcategoryName,SALES
                     ,ROW_NUMBER() OVER(PARTITION BY
                           CalendarYear,ProductKey
                          ,EnglishProductSubcategoryName
                       ORDER BY Sales DESC) RNO
         FROM (select b.CalendarYear,c.ProductKey
                                ,d.EnglishProductSubcategoryName
                                ,SUM(a.SalesAmount) as SALES
                       from FactInternetSales as A 
                           inner join dimdate as B
                                 on a.OrderDateKey =b.DateKey
                           inner join DimProduct as c
                                on c.ProductKey = a.ProductKey
                           inner join DimProductSubcategory as d
                                on c.ProductSubcategoryKey = d.ProductSubcategoryKey
                           inner join  DimProductCategory as e 
                                on d.ProductCategoryKey=e.ProductCategoryKey
                        group by b.CalendarYear,c.ProductKey
                          ,  d.EnglishProductSubcategoryName)t
  )
   SELECT CalendarYear,ProductKey
                      ,EnglishProductSubcategoryName,SALES
    FROM cte_1
    WHERE RNO<4
    ORDER BY CalendarYear DESC,RNO ASC

在提供的脚本中，您只选择结果集中的top3记录。因此，您将获得3条记录作为输出。

Answer 2

一般的想法可能是为每组行添加一个列计数器（1 2 3 ...），然后选择计数器小于或等于3的记录

列出每年最畅销的3款产品

2 个答案: