从不同类别中选择前n个

Question

因此，我想选择每年每季度销售量最高的10种产品。季度为一年的1/4。 例如：

年-> 2017 第一季度：销售量排名前十的产品

我想要这种输出：（其中键-> ProductKey，ProductVolume->该产品的销售数量，季度->所讨论的季度数，年份->所讨论的年份。

|键|产品数量|季度|年份| ....... ....

第二季度：十大畅销产品 ... 年份-> 2016 第一季度：售出的十大产品 第二季度：销量最高的十大产品

SELECT s.ProductKey as [Key],
    COUNT(s.ProductKey) as [ProductVolume],
    datepart(q, s.OrderDate) as [Quarter],(yyyy, s.OrderDate) as [Year]
FROM (Select p.ProductKey,
             s.OrderDate,
             row_number() over(PARTITION BY datepart(q, s.OrderDate)
                order by 
                p.ProductKey desc) as rn
      FROM Sales as s 
      INNER JOIN SalesProduct as sp
          ON sp.SalesKey=s.SalesKey
      INNER JOIN Product as p
          ON p.ProductKey=sp.ProductKey
      ) as s
WHERE datepart(yyyy, s.OrderDate) 
    BETWEEN YEAR(getdate())-2 AND YEAR(getdate())
GROUP BY datepart(q, s.OrderDate), datepart(yyyy, s.OrderDate), s.ProductKey

这是我现在获得的结果，所有结果...

enter image description here

上面的图像表示此查询的结果，即我在内部联接中使用的表的布局。

Select top 1 * from Product;
  Select top 1 * from Sales;
  Select top 1 * from SalesProduct;

Answer 1

按每季度+年每种产品的销售价值排序。

DECLARE @Sales TABLE (
    SalesKey INT,
    OrderDate DATETIME
)

DECLARE @SalesProduct TABLE (
    SalesKey INT,
    ProductKey INT,
    UnitPrice MONEY,
    OrderQuantity TINYINT
)

INSERT INTO @Sales(SalesKey,OrderDate) SELECT 1, '2018-05-18'
INSERT INTO @Sales(SalesKey,OrderDate) SELECT 2, '2018-05-18'

INSERT INTO @SalesProduct(SalesKey,ProductKey,UnitPrice,OrderQuantity) SELECT 1,123,3.50,1
INSERT INTO @SalesProduct(SalesKey,ProductKey,UnitPrice,OrderQuantity) SELECT 1,125,3.50,1
INSERT INTO @SalesProduct(SalesKey,ProductKey,UnitPrice,OrderQuantity) SELECT 2,123,2.50,5

SELECT *
FROM (
    Select
        datepart(year, s.OrderDate) AS [Year],
        datepart(q, s.OrderDate) AS [Quarter],
        sp.ProductKey,
        sum(sp.OrderQuantity) AS [TotalOrdered],
        sum(sp.UnitPrice * sp.OrderQuantity) AS [TotalValue],
        row_number() over(PARTITION BY datepart(year, s.OrderDate),datepart(q, s.OrderDate) order by sum(sp.OrderQuantity) desc) as [Row]
    FROM @Sales as s 
    INNER JOIN @SalesProduct as sp ON sp.SalesKey=s.SalesKey
    WHERE datepart(yyyy, s.OrderDate) BETWEEN YEAR(getdate())-2 AND YEAR(getdate())
    GROUP BY datepart(year, s.OrderDate),datepart(q, s.OrderDate),sp.ProductKey
) dat
WHERE dat.[Row]<=10