PHP中的数学

Question

我是初学者.我有两个问题.

这是我的查询:

$result = mysql_query( "select SUM(achievenum) as achieve_rows from games" );
$row = mysql_fetch_object( $result );
$total_achieve = $row->achieve_rows;

$result = mysql_query( "select SUM(achieveget) as get_rows from games" );
$row = mysql_fetch_object( $result );
$get_achieve = $row->get_rows;

$completed_rate = $get_achieve * 100 / $total_achieve;

1. 如何使用一个查询而不是两个查询来创建此代码？

2. 当我显示百分比

表明

Completion Rate : 32.3529411765% 

我需要它只显示前三个数字.

32.3 %

Answer 1

要修改你的sql,请使用:

select 
    SUM(achievenum) as achieve_rows, 
    select SUM(achievenum) as achieve_rows 
from games

要显示结果,您希望首先使用round格式化它:

<?php 
    echo round($completed_rate,1)."%"; 
?>