如何選擇範圍內的值

Question

我在表中有兩列。

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，則佣金應爲18

• 如果我的百分比是97.5，則佣金應該是19

我該怎麼辦這在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

僅僅是爲了提供另一種選擇的緣故：

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 

正如我在你的問題評論說，這是不完全清楚哪一行實際上應該提供正確的輸出，最大Percntage或最大Commission的那個。基於此，您可能需要用ORDER BY Commission DESC替換ORDER BY Percentage DESC。