在MySQL 中,我们可以使用CAST函数或CONVERT函数来将字符串转换成 double 类型。这两个函数的语法非常相似,具体如下: 使用CAST函数: CAST(expressionASDOUBLE) 1. 使用CONVERT函数: CONVERT(expression,DOUBLE) 1. 在上面的语法中,expression是要转换的字符串表达式,DOUBLE是要转换成的目标数据类型。需要注意的是,如果...
二、String转double 1、select cast("111.11" as decimal(10,2)); 2、select convert("111.11",decimal(10,2);
使用CAST函数将字符串转换为DOUBLE类型: SELECT CAST('10.5' AS DOUBLE); 复制代码 这将返回浮点型值10.5。 使用CONVERT函数将字符串转换为INT类型: SELECT CONVERT('10', SIGNED); 复制代码 这将返回整型值10。 使用CONVERT函数将字符串转换为DOUBLE类型: SELECT CONVERT('10.5', DECIMAL(10,2)); 复制代...
MySQL 字符串 转 int/double CAST与CONVERT 函数的用法 MySQL 的CAST()和CONVERT()函数可用来获取一个类型的值,并产生另一个类型的值。两者具体的语法如下: CAST(valueas type); CONVERT(value, type); 就是CAST(xxx AS 类型), CONVERT(xxx,类型)。 mysql>SELECTCAST('3.35'AS signed); +---+ |CAST('...
| DOUBLE_NUMBER | +---+ | 1000.00 | | 1000.01 | +---+ 2 rows in set (0.00 sec) Thanks Subject Written By Posted Convert String to Double Steven Bellamy January 27, 2006 08:17AM Sorry, you can't reply to this topic. It has been closed....
转换在官方文档写的很清楚,这里两边都转换为了double类型进行比较。 二、简单测试 实际上我们可以用一个double类型的字段插入字符串就可以测试这种情况: mysql>use testmtsReadingtable informationforcompletion of tableandcolumn namesYoucan turn off this feature to get a quicker startup with-ADatabasechanged ...
MySQL字符串转indouble类型——CASTCONVERT函数的⽤法MySQL 的CAST()和CONVERT()函数可⽤来获取⼀个类型的值，并产⽣另⼀个类型的值。两者具体的语法如下：CAST(value as type);CONVERT(value, type);就是CAST(xxx AS 类型), CONVERT(xxx,类型)。Sql代码收藏代码 mysql> SELECT CAST('3.35' AS ...
converted to a double-precision floating-point. From the manual: "If a numeric expression contains any strings, they are converted to double-precision floating-point values and the expression is approximate." Why not, if the comparing to a DECIMAL type, convert the string instead to decimal ...
两个数据相乘,获取到的值,是double类型,需要转为,int 类型。备注一下(MySQL) CONVERT((p.totalCount)*(r.rate)/100 ,SIGNED) as groupTotal select r.rate,c.groupName, CONVERT((p.totalCount)*(r.rate)/100 ,SIGNED) as groupTotal from xxx.notify_content_setting_new c...
> Can I convert the char value to a double ? In fact, you don't want a DOUBLE but a DECIMAL. If you want to store your prices up to cent precision you should use DECIMAL(n,2) (where n depends on you business ambitions - 12 should normally suffice :-) ...