SQL 钱四舍五入到最接近的 0.05 美分

Question

我正在尝试将 MySQL SELECT 中的钱四舍五入到最接近的 0.05 美分。

所以数字像：

140.70  should become 140.70
140.71  should become 140.70
140.72  should become 140.70
140.73  should become 140.75
140.74  should become 140.75
140.75  should become 140.75
140.76  should become 140.75
140.77  should become 140.75
140.78  should become 140.80
140.79  should become 140.80

所以更详细

0.00 = 0.00
0.01 = 0.00
0.02 = 0.00
0.022 = 0.00   // here the magic should happen 0.022 is closer to 0, so result is 0
0.023 = 0.05   // but 0.023 should be rounded to 0.05! cause first round 0.023 to 0.025 which should then be rounded up to 0.05
0.03 = 0.05

我用 MySQL CEIL() and MySQL FLOOR() 尝试了一些不同的方法，但无法得到正确的结果。

创建了 SQL Fiddle here

table 没有任何意义，除非我们需要 SELECT 来自：

CREATE TABLE hello ( world varchar(255) );
INSERT INTO hello (world) VALUES ('blubb');

这是 select 查询：

SELECT 

 CEILING ( 0.05 / 0.05 ) * 0.05 AS CEIL_1,
 CEILING ( 0.06 / 0.05 ) * 0.05 AS CEIL_2,
 CEILING ( 0.07 / 0.05 ) * 0.05 AS CEIL_3,
 CEILING ( 0.08 / 0.05 ) * 0.05 AS CEIL_4,
 CEILING ( 0.09 / 0.05 ) * 0.05 AS CEIL_5

FROM hello;

这里有人告诉我正确的做法吗？

Answer 1

SELECT ROUND(140.77/5,2) * 5;
+-----------------------+
| ROUND(140.77/5,2) * 5 |
+-----------------------+
|                140.75 |
+-----------------------+

SQL 钱四舍五入到最接近的 0.05 美分

SQL money round to closest 0.05 cents

mysql

math

rounding