用于定价分析的 SQL 查询

Question

在 YearMonth 列上查找最小和最大定价状态时面临的问题，

下面是我的表格数据

   YearMonth    STATE   ProductGroup    LocaProdname    Price
    201407      MH      AIRTEL          AIRTEL-3G       10,000
    201208      GJ      IDEA            IDEA-3G         1,200
    201406      WB      AIRCEL          AIRCEL PERPAID  5,866
    201407      DL      TATA DOCOMA     TATA LANDLINE   8,955
    201207      KAR     VODAFONE        VODAFONE-3G     7,899
    201312      MH      AIRTEL          AIRTEL-3G       15,000
    201408      GJ      IDEA            IDEA-3G         25,000

我需要以下输出：

YearMonth   STATE   ProductGroup    LocaProdname    Price   Indictor-YEAR
201407      MH      AIRTEL          AIRTEL-3G       10,000  MAX
201312      MH      AIRTEL          AIRTEL-3G       15,000  MIN
201408      GJ      IDEA            IDEA-3G         25,000  MAX
201208      GJ      IDEA            IDEA-3G         1,200   MIN

我需要 Max yearmonth 和 min Year 值。

Answer 1

请使用带有分区 BY 的 Row_number 并根据需要删除不需要的代码，

SELECT yearmonth,state,productgroup,locaprodname,price,operation
    FROM   (
    SELECT * FROM   (SELECT p.yearmonth,p.state,p.productgroup,p.locaprodname,p.price,'MAX' AS Operation,
                           Row_number() OVER( partition BY p.productgroup, p.locaprodname
                               ORDER BY p.price DESC) AS Row
                    FROM   pricingtest p) AS Maxx
            WHERE  Maxx.row = 1

    UNION ALL

    SELECT * FROM   (SELECT p.yearmonth,p.state,p.productgroup,p.locaprodname,p.price,'MIN' AS Operation,
                           Row_number() OVER( partition BY p.productgroup, p.locaprodname
                               ORDER BY p.price ASC) AS Row
                    FROM   pricingtest p) AS Minn
            WHERE  Minn.row = 1

    ) AS whole
    ORDER  BY yearmonth,productgroup  

Answer 2

一旦您获得最后一条和第一条记录，您就可以 UNION 结果：

SELECT t.*, 'MIN' AS Indicator
FROM 
  myTable t LEFT JOIN 
  myTable t2 ON t.YearMonth = t2.YearMonth AND t2.price < t.price
WHERE t2.YearMonth IS NULL
UNION
SELECT t.*, 'MAX' AS Indicator
FROM 
  myTable t LEFT JOIN 
  myTable t2 ON t.YearMonth = t2.YearMonth AND t2.price > t.price
WHERE t2.YearMonth IS NULL

如果您有多个相同最高价格的记录，上述查询将返回所有记录。此外，如果您在一个月内只有一条记录，则会返回 MIN 和 MAX 的两倍。

Answer 3

这可以通过查找与LocaProdname、ProductGroup 和State 关联的 MAX/MIN 值来完成，然后加入所有匹配的表。见下文，或在http://sqlfiddle.com/#!3/4d6bd/2查看小提琴

注意：我已经添加了HAVING COUNT(*) > 1，因为您似乎只想要改变价格的那些。 （即有超过 1 个条目）

SELECT p.YearMonth
    ,p.State
    ,p.ProductGroup
    ,p.LocaProdname
    ,p.Price
    ,CASE 
        WHEN p.Price = a.MaxPrice
            THEN 'MAX'
        WHEN p.Price = a.MinPrice
            THEN 'MIN'
        END AS [Indicator-YEAR]
FROM PricingTest p
INNER JOIN (
    SELECT LocaProdname
        ,ProductGroup
        ,State
        ,MAX(Price) AS MaxPrice
        ,MIN(Price) AS MinPrice
    FROM pricingTest
    GROUP BY LocaProdname
        ,ProductGroup
        ,State
    HAVING COUNT(*) > 1
    ) a ON a.LocaProdname = p.LocaProdname
    AND a.ProductGroup = p.ProductGroup
    AND a.State= p.State
    AND (
        a.MaxPrice = p.Price
        OR a.MinPrice = p.Price
        )
ORDER BY LocaProdname

编辑：或者我只是注意到这是用户可能正在寻找的最大/最小YearMonth，如果是这种情况，请查看http://sqlfiddle.com/#!3/4d6bd/4 它基本上只是将所有对Price 的引用替换为YearMonth。

Answer 4

如果我理解正确，您可以使用row_number()：

select YearMonth, STATE, ProductGroup, LocaProdname, Price,
       (case when seqnum_asc = 1 then 'MIN' else 'MAX' end) as Indicator
from (select d.*,
             row_number() over (partition by state, productgroup, localprodname
                                order by price asc) as seqnum_asc,
             row_number() over (partition by state, productgroup, localprodname
                                order by pricedesc) as seqnum_desc
      from data
     ) d
where seqnum_asc = 1 or seqnum_desc = 1;

编辑：

这是你想要的吗？

select YearMonth, STATE, ProductGroup, LocaProdname, Price,
       (case when seqnum_asc = 1 then 'MIN' else 'MAX' end) as Indicator
from (select d.*,
             row_number() over (partition by YearMonth
                                order by price asc) as seqnum_asc,
             row_number() over (partition by YearMOnth
                                order by pricedesc) as seqnum_desc
      from data
     ) d
where seqnum_asc = 1 or seqnum_desc = 1;