SQL简单舍入

Question

查询：

declare @a float(10);
declare @b float(10);
declare @c float(10);
set @a = 150.50;
set @b = 19;
set @c = 100;
select @a * @b / @c as result
,ROUND(@a * @b / @c, 2) as rounded

结果：

| result  | rounded  |    
----------------------
| 28.595  | 28.59    |

应四舍五入为28.60吗？我该如何实现？

Answer 1

不使用浮点数，而是一些精确的数据类型，例如decimal（）：

declare @a decimal(19,5);
declare @b decimal(19,5);
declare @c decimal(19,5);
set @a = 150.50;
set @b = 19;
set @c = 100;
select @a * @b / @c as result
,ROUND(@a * @b / @c, 2) as rounded

结果

result  rounded
28.595000   28.600000