MySQL舍入函数 [英] MySQL Rounding functions
本文介绍了MySQL舍入函数的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在寻找一种ROUND()类型的函数，该函数可以让我将数字四舍五入到小数点后1位，也可以四舍五入到最接近的0.5.
I am looking for a ROUND() type function that would allow me to round numbers to 1 decimal place but also to the nearest 0.5.
说明:
19.425 => 19.5
19.124 => 19.0
类似地:
12.654 => 12.5
12.845 => 13.0
推荐答案
正如vissi所说，要获得结果，您需要2个舍入语句. (到小数点后一位)
As vissi said, to get the result you want you'll need 2 round statements. (To get to 1 decimal place)
SELECT ROUND(ROUND(19.425 * 2) / 2, 1) #19.5
SELECT ROUND(ROUND(19.124 * 2) / 2, 1) #19.0
SELECT ROUND(ROUND(12.654 * 2) / 2, 1) #12.5
SELECT ROUND(ROUND(12.845 * 2) / 2, 1) #13.0
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