一列的累计和

问题描述

我有一个包含以下数据的表格。

COUNTRY LEVEL   NUM_OF_DUPLICATES
  US    9           6
  US    8           24
  US    7           12
  US    6           20
  US    5           39
  US    4           81
  US    3           80
  US    2           430
  US    1           178
  US    0           430

我编写了一个查询来计算累积行的总和并得到以下输出。

COUNTRY LEVEL   NUM_OF_DUPLICATES      POOL
  US    9           6                   6
  US    8           24                  30
  US    7           12                  42
  US    6           20                  62
  US    5           39                  101
  US    4           81                  182
  US    3           80                  262
  US    2           130                 392
  US    1           178                 570
  US    0           254                 824

现在我想过滤数据并只在 POOL

COUNTRY LEVEL   NUM_OF_DUPLICATES      POOL
  US    9           6                   6
  US    8           24                  30
  US    7           12                  42
  US    6           20                  62
  US    5           39                  101
  US    4           81                  182
  US    3           80                  262
  US    2           130                 392

请告诉我您的想法。提前致谢。

解决方法

declare @t table(Country varchar(5),Level int,Num_of_Duplicates int)
insert into @t(Country,Level,Num_of_Duplicates)
values
('US',9,6),('US',8,24),7,12),6,20),5,39),4,81),3,80),2,130/*-92*/),1,178),430);


select *,sum(Num_of_Duplicates) over(partition by country order by Level desc),(sum(Num_of_Duplicates) over(partition by country order by Level desc)-Num_of_Duplicates) / 300 as flag,--any row which starts before 300 will have flag=0
--or
case when sum(Num_of_Duplicates) over(partition by country order by Level desc)-Num_of_Duplicates < 300 then 1 else 0 end as startsbefore300
from @t;

select *
from
   (
    select *,sum(Num_of_Duplicates) over(partition by country order by Level desc) as Pool
    from @t
) as t
where Pool - Num_of_Duplicates < 300 ;

,

我使用了两个临时表来得到答案。

 DECLARE @t TABLE(Country VARCHAR(5),[Level] INT,Num_of_Duplicates INT)
 INSERT INTO @t(Country,Num_of_Duplicates)
  VALUES ('US',130),254);


SELECT 
    Country,Num_of_Duplicates,SUM (Num_of_Duplicates) OVER (ORDER BY id) AS [POOL]
 INTO #temp_table
FROM
   (
    SELECT
        Country,level,ROW_NUMBER() OVER (ORDER BY country) AS id
    FROM    @t
 ) AS A 


SELECT  
    [POOL],ROW_NUMBER() OVER (ORDER BY [POOL] )   AS [rank]
INTO #Temp_2
FROM  #temp_table 
WHERE [POOL] >= 300


SELECT * 

FROM #temp_table WHERE 
[POOL]   <= (SELECT [POOL] FROM #Temp_2 WHERE [rank] = 1 ) 

    
DROP TABLE #temp_table
DROP TABLE #Temp_2