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MySQL 查询结果以百分比显示简单实现_MySQL

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Release: 2016-06-01 13:25:20
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bitsCN.com 找了一些资料,然后我是用到了MySQL字符串处理中的两个函数concat()和left()

1、CONCAT(str1,str2,...)
返回来自于参数连结的字符串。如果任何参数是NULL, 返回NULL。可以有超过2个的参数。一个数字参数被变换为等价的字符串形式。

示例

select CONCAT('My', 'S', 'QL');
-> 'MySQL'

select CONCAT('My', NULL, 'QL');
-> NULL

select CONCAT(14.3);
-> '14.3'

2、LEFT(str,length)
从左开始截取字符串.说明:left(被截取字段,截取长度)

结合1、2 :concat ( left (数值1 / 数值2 *100,5),'%') as 投诉率bitsCN.com

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