我们正常进行除法运算时,sql默认是返回一个四舍五入的数

比如12除以5,17除以3

--算法1:返回结果:2  需要的是2.40
select (12/5) as 结果1
--算法2:返回结果:5 需要的是5.67
select (17/3) as 结果2

返回结果如下:

aaarticlea/png;base64,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" alt="" />

那么如何拿到2.40 和5.67呢

--算法3:返回结果:2.40
select cast(12*1.0/5 as decimal(18,2)) as 结果3
--算法4:返回结果:5.67
select cast(17*1.0/3 as decimal(18,2)) as 结果4

返回真正结果

aaarticlea/png;base64,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" alt="" />

我们得到结果是2.40 和5.67,那么如何得到整数部分和小数部分

--获取2.40的整数部分
select FLOOR(2.40) as 整数部分
--获取2.40的小数部分
select (2.40-FLOOR(2.40)) as 小数部分 --获取5.67的整数部分
select FLOOR(5.67) as 整数部分
--获取5.67的小数部分
select (5.67-FLOOR(2.40)) as 小数部分

返回结果(两个一起查,上面是单个)

aaarticlea/png;base64,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" alt="" />

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