Question

我有一个表，其中包含诸如Price_Date，分类，大小，等级，国家和价格等列。该表有时不包含星期日或节假日的数据（例如圣诞节，感恩节等）。

我要在这里实现的是，当表中不包含特定日期的数据时，我希望它自动填充前一天的数据。

例如，该表不包含01/06/2019数据。它根本没有日期。在这种情况下，我想自动分配丢失的01/06/2019日期并用01/05/2019数据填充它。

Price_Date            Catagory  Size    Grade   Country Price
--------------------------------------------------------------------------------
2019-01-05              0        32      1         2    24.25
2019-01-05              0        36      1         2    24.25
2019-01-05              0        40      1         2    24.25
2019-01-05              0        48      1         2    24.25
2019-01-05              0        60      1         2    23.25
2019-01-05              0        70      1         2    21.25
2019-01-05              0        84      1         2    17.25

这是我想到的SQL查询。

对不起，如果我在错误的部分发布了这篇文章。

WITH MyRowSet
   AS
   (
         select distinct 
                       d.date_key
                       ,p.Size_Value
                       ,Catagory_Value
                       ,cast (Price_Date as datetime) as prev_effex
                       ,ROW_NUMBER() OVER (PARTITION BY date_key,Size_Value,Catagory_Value order by date_key,cast (Price_Date as datetime)  desc) AS RowNum
         from
         FSPPRICE  P 

          CROSS APPLY Dim_Time d
         where

         d.Date_KEY <(GETDATE()) and                           

         (D.Date_KEY > (select min(cast (Price_Date as datetime)) as min_date from FSPPRICE))

         and

         cast (Price_Date as datetime) <> D.Date_Key and cast (Price_Date as datetime) < D.Date_Key


         group by  d.date_key,Price_Date,Size_Value,Catagory_Value

  )
    SELECT 
                       r.Date_KEY AS effectiveon
                       ,P.Catagory_Value
                       ,cast(P.Size_Value as varchar) as Size_Value
                       ,P.Grade_Value
                       ,P.Country
                       ,P.Price
                       ,P.Active_Code
         FROM     MyRowSet AS R INNER JOIN
             FSPPRICE AS P 
             ON r.prev_effex = P.Price_Date and r.Catagory_Value=p.Catagory_Value and r.Size_Value=p.Size_Value WHERE (rownum < 2)

Answer 1

declare @dt date = GETDATE();--any given date
select @dt as price_date, category, size, grade, grade, country, price
from 
    @t
where price_date in (select MAX(price_date) price_date from @t where price_date <= @dt)

从今天没有数据的前一天开始自动分配值

1 个答案: