Question

如何将十进制值拆分为两个十进制值。如果小数部分小于.50或大于.50 .it的十进制数应该以这样的方式分割，即第一个不应该仅以.00或.50结尾。第二个值应包含剩余的阶乘值。

ex.  19.97 should return 19.50 & 0.47
     19.47               19.00 & 0.47

Answer 1

你可以通过乘以2来“降低”到0.5的最高倍数，调用FLOOR，然后除以2.从那里只从原始值中减去得到余数。

DECLARE @test decimal(10,7)
SELECT @test =19.97

SELECT 
    FLOOR(@test * 2) / 2 AS base, 
    @test - FLOOR(@test * 2) / 2 AS fraction

或减少重复

SELECT 
    base, 
    @test - base AS fraction
FROM ( SELECT FLOOR(@test * 2) / 2 AS base )

Answer 2

Declare @money money

Set @money = 19.97

Select  convert(int,@money - (@money % 1))  as 'LeftPortion'
       ,convert(int, (@money % 1) * 100)    as 'RightPortion'

Answer 3

观察加倍0.5给出1，这是一个整数。这导致了一个简单的算法：

加倍数
使用floor(x)和x-floor(x)
将每个部分分别除以2，以便为您提供所需的结果。

我们以你的数字为例：

19.97 * 2 = 39.94
Whole part = 39, fractional part = 0.94
Dividing each part by 2 individually, we get
39/2 = 19.50
0.94/2 = 0.47

19.47 * 2 = 38.94
Whole part = 38, fractional part = 0.94
Dividing each part by 2 individually, we get
38/2 = 19.00
0.94/2 = 0.47

Answer 4

您需要查看MODULO operator in SQL Server.

SELECT 
19.97 as myDecVal , 
19.97 % 0.5 AS decGreaterThan50,/*should return 0.47*/ 
19.97- (19.97 % 0.5) as roundedToNearestZeroPoint5 /*should return 19.50*/;

在sql server中将十进制值拆分为较低的十进制值

4 个答案: