Select 价格组内按季度的最畅销产品 ID

Question

我有这个查询：

WITH product_grouped AS (
    SELECT 
    p.uniqueid, 
    cost, 
    case WHEN cost <= 10 THEN '0-10'
        WHEN cost > 10 AND cost <= 25 THEN '10 < Price <= 25'
        WHEN cost >= 25 and cost <= 100 THEN '25 < Price <= 100'
        ELSE 'Price > 100' end AS price_group
    FROM mmc..product p
    ),
quarters_grouped AS (
    SELECT
    uniqueid,
    unitprice,
    quantity,
    cart_orderdate,
    case WHEN c.cart_orderdate >= DATEADD(QUARTER, -1, getdate()) THEN 'Q1'
    WHEN c.cart_orderdate >= DATEADD(QUARTER, -2, getdate()) and c.cart_orderdate < DATEADD(QUARTER, -1, getdate())THEN 'Q2'
    WHEN c.cart_orderdate >= DATEADD(QUARTER, -3, getdate()) and c.cart_orderdate < DATEADD(QUARTER, -2, getdate())THEN 'Q3'
    WHEN c.cart_orderdate >= DATEADD(QUARTER, -4, getdate()) and c.cart_orderdate < DATEADD(QUARTER, -3, getdate())THEN 'Q4'
    WHEN c.cart_orderdate >= DATEADD(QUARTER, -5, getdate()) and c.cart_orderdate < DATEADD(QUARTER, -4, getdate())THEN 'Q5'
    WHEN c.cart_orderdate >= DATEADD(QUARTER, -6, getdate()) and c.cart_orderdate < DATEADD(QUARTER, -5, getdate())THEN 'Q6'
    WHEN c.cart_orderdate >= DATEADD(QUARTER, -7, getdate()) and c.cart_orderdate < DATEADD(QUARTER, -6, getdate())THEN 'Q7'
    WHEN c.cart_orderdate >= DATEADD(QUARTER, -8, getdate()) and c.cart_orderdate < DATEADD(QUARTER, -7, getdate())THEN 'Q8'
    end AS quarters
    FROM omc..cart c
    WHERE c.cart_orderdate > '2018-01-01'
    ),
sum_by_quarter AS (
    SELECT pg.uniqueid, price_group, quarters, SUM(unitprice * quantity) AS total_sold
    FROM product_grouped pg
    INNER JOIN quarters_grouped qg
        ON pg.uniqueid = qg.uniqueid
    GROUP BY pg.uniqueid, price_group, quarters
),
partition_five AS (
    SELECT quarters, price_group, uniqueid, total_sold, ROW_NUMBER() OVER (PARTITION BY  quarters, price_group ORDER BY total_sold DESC) AS RowNo
    FROM sum_by_quarter
    )

SELECT *
FROM partition_five
WHERE RowNo <= 5
ORDER BY  quarters, price_group, total_sold desc

我想知道过去 8 个季度中不同价格范围的产品的前 5 个销售产品 ID。其中最畅销的定义为来自购物车 table 的 unitprice * quantity。价格区间为 Cost <= , 10 < Cost <= 25, 25 < Cost <= 100, Cost < 100。我的查询给了我想要的东西，但是有没有更简单的方法可以在没有所有 case 语句的情况下做到这一点？

Answer 1

考虑根据日期差异计算季度差异。

'Q' + CONVERT(VARCHAR(5), CEILING(DATEDIFF(day, c.cart_orderdate, getdate()) / 91) + 1)

具体在 quarters_grouped CTE 中：

...
quarters_grouped AS (
    SELECT
          uniqueid,
          unitprice,
          quantity,
          cart_orderdate,
          'Q' + CONVERT(VARCHAR(5), CEILING(DATEDIFF(day, c.cart_orderdate, getdate()) / 91) + 1) AS quarters
    FROM omc..cart c
    WHERE c.cart_orderdate > '2018-01-01'
),
...

Rextester Demo （日期随机）

Select 价格组内按季度的最畅销产品 ID

Select Top Selling ProductID By Quarter Within Price Group

sql

sql-server

case

partition