使用常数 T-SQL 运行总计

Question

我有数据看起来像这样

MILEAGE January February    ........December
   0       0        0   
   2       0.066    0.052
   3       0.081    0
   5       0        0.062
   6       0.080    0   .........
 813       0        0  and so on

我希望数据看起来像这样

Mileage      January   February ..... December
  0         (Total of Mileage less and equal to zero for each month)
  2000       Total of Mileage upto 2000 for each month
  4000       Total of Mileage upto 4000 for each month
  6000       Total of Mileage upto 6000 for each month 
  8000       and so on....
  10000
  12000
  14000
  2 thousand increment up till 
  50000

非常感谢您的帮助。 我正在使用 SQL Server 2008 R2，但不确定如何实现

Answer 1

您可以使用递归 CTE 来制作表格，如下所示动态列出值。 但是，如果这是偶尔的临时事情，您只会想要这样做。 如果您要经常（例如每个月）这样做，只需像制作任何其他表一样制作表格，然后您可以添加索引并加入它。

最常见的做法是有一个计数表 0、1、2、3 等，直到某个大数。 然后你可以用SELECT val*2000 FROM counting_table WHERE val*2000 >= 5000得到你的结果。 这个计数表可以在许多类似的情况下重复使用，但它是通用的。

WITH mile_table as
(
  -- use recursive cte to make a table with number 0 - 50000 by 2000
  SELECT 0 as milage

  UNION ALL

  SELECT mile_table.milage+2000
  FROM mile_table
  WHERE mile_table.milage+2000 <= 50000
)
SELECT mile_table.milage,
       sum(a.January) as January,
       sum(a.February) as February,
       --- ....
       sum(a.December) as December,
FROM mile_table 
JOIN your_table a ON a.milage >= mile_table.milage
GROUP BY mile_Table.milage

Answer 2

尝试这样的事情：

DECLARE @i as INT = -2000

CREATE TABLE #T 
(
  MileageFrom INT, 
  MileageTo INT
)

WHILE (@i <=50000)
BEGIN
  INSERT INTO #T 
    values(@i, @i+2000)

  SET @i= @i+2000
END

SELECT 
  A.MileageTo, 
  SUM(January) as january, 
  SUM(Feburary) as Feb ....,
  SUM(DEC) as DEC
FROM YourTable A 
JOIN #T B ON A.Mileage BETWEEN B.MileageFrom and B.MileageTo

您只需要稍微调整 MileageFrom 值以包含所有小于 -2000 的值