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方法一：最好的办法是将float字段改为decimal(16,6)。具体方法：可设置一个临时字段，结合MySQL的关键字binary进行准确复制等。
方法二：使用binary关键字解决。具体操作为“select sum(binary 字段名(float类型))”
BINARY不是函数，是类型转换运算符，它用来强制它后面的字符串为一个二进制字符串
例子：
"select sum(a.number*binary(b.price)) as total
from ler_card as a
left join ler_items as b on a.itemId=b.itemId
where user_id=1"
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mysql怎么替换换行符Apr 18, 2022 pm 03:14 PM在mysql中，可以利用char()和REPLACE()函数来替换换行符；REPLACE()函数可以用新字符串替换列中的换行符，而换行符可使用“char(13)”来表示，语法为“replace(字段名,char(13),'新字符串') ”。
mysql怎么将varchar转换为int类型May 12, 2022 pm 04:51 PM转换方法：1、利用cast函数，语法“select * from 表名 order by cast(字段名 as SIGNED)”；2、利用“select * from 表名 order by CONVERT(字段名,SIGNED)”语句。
MySQL复制技术之异步复制和半同步复制Apr 25, 2022 pm 07:21 PM本篇文章给大家带来了关于mysql的相关知识，其中主要介绍了关于MySQL复制技术的相关问题，包括了异步复制、半同步复制等等内容，下面一起来看一下，希望对大家有帮助。
带你把MySQL索引吃透了Apr 22, 2022 am 11:48 AM本篇文章给大家带来了关于mysql的相关知识，其中主要介绍了mysql高级篇的一些问题，包括了索引是什么、索引底层实现等等问题，下面一起来看一下，希望对大家有帮助。
mysql-connector是什么May 12, 2022 pm 04:04 PM“mysql-connector”是mysql官方提供的驱动器，可以用于连接使用mysql；可利用“pip install mysql-connector”命令进行安装，利用“import mysql.connector”测试是否安装成功。
深入解析C语言中static关键字的作用和用法Feb 20, 2024 pm 04:30 PM深入解析C语言中static关键字的作用和用法在C语言中，static是一种非常重要的关键字，它可以被用于函数、变量和数据类型的定义上。使用static关键字可以改变对象的链接属性、作用域和生命周期，下面就来详细地解析一下static关键字在C语言中的作用和用法。static变量和函数：在函数内部使用static关键字定义的变量称为静态变量，它具有全局生命周
mysql需要commit吗Apr 27, 2022 pm 07:04 PM在mysql中，是否需要commit取决于存储引擎：1、若是不支持事务的存储引擎，如myisam，则不需要使用commit；2、若是支持事务的存储引擎，如innodb，则需要知道事务是否自动提交，因此需要使用commit。
mysql中字符串怎么转为整型May 12, 2022 pm 05:44 PM方法：1、利用“字符串+0”转换，语法为“(column+0)”；2、利用CONVERT函数转换，语法为“CONVERT(column,SIGNED)”；3、利用CAST函数转换，语法为“CAST(column as SIGNED)”。
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