如何选择范围内的值

Question

我在表中有两列。

Percentage, Commission 
100   20 
98   19.5 
97.5   19 
96.25   18.5 
95   18 
... 
80   15 

• 如果我的百分比是95.25，则佣金应为18

• 如果我的百分比是97.5，则佣金应该是19

我该怎么办这在SQL Server中？

Answer 1

SELECT MAX(Commission) FROM #test 
WHERE Percentage <= 96.25 

Answer 2

select top 1 Commission 
from theTable 
where Percentage <= 96.25 
order by Percentage desc 

Answer 3

仅仅是为了提供另一种选择的缘故：

WITH ranked AS (
    SELECT 
    *, 
    rank = CASE 
     WHEN Percentage > @MaxPercentage THEN 0 
     ELSE ROW_NUMBER() OVER (ORDER BY Percentage DESC) 
    END 
    FROM atable 
) 
SELECT Commission 
FROM ranked 
WHERE rank = 1 

正如我在你的问题评论说，这是不完全清楚哪一行实际上应该提供正确的输出，最大Percntage或最大Commission的那个。基于此，您可能需要用ORDER BY Commission DESC替换ORDER BY Percentage DESC。