计算总价值的百分比

Question

好的，我想知道总行数中有多少百分比是正确的（结果=1）结果 2 意味着它仍然有效，所以只需要结果！= 2

的总行数

我有以下代码，但没有显示任何内容我做错了什么（公平地说我还睡着了一半）

$successq = mysqli_query($con,"SELECT COUNT(*) FROM `table` 
WHERE `result` ='1'");

$success = mysqli_fetch_assoc($successq);

$totalq = mysqli_query($con,"SELECT COUNT(*) FROM `table` 
WHERE `result` !='2'");

$total = mysqli_fetch_assoc($totalq);

$percent = ($success/$total) * 100;

Answer 1

您需要为 COUNT(*) 添加别名，然后您需要使用该别名来获取值。

您需要echo您的最终输出。

按如下操作：-

$successq = mysqli_query($con,"SELECT COUNT(*) as success FROM `table` 
WHERE `result` ='1'");//success used as alias

$success = mysqli_fetch_assoc($successq);

$totalq = mysqli_query($con,"SELECT COUNT(*) as total FROM `table` 
WHERE `result` !='2'");// total use as alias

$total = mysqli_fetch_assoc($totalq);


echo $percent = ($success['success'] /$total['total'] ) * 100;// use aliases and echo the output

注意：- mysqli_fetch_assoc() return 关联数组，所以不能作为多变的。您必须使用它的关联索引从中获取值（就像我在 echo $percent = ($success['success'] /$total['total'] ) * 100; 中所做的那样）。

Answer 2

因为mysqli_fetch_assoc return数组不是单值。所以改变你的代码如下：

$successq = mysqli_query($con,"SELECT COUNT(*) as total FROM `table` 
WHERE `result` ='1'");
$success = mysqli_fetch_assoc($successq);
$success_cnt = $success["total"];
$totalq = mysqli_query($con,"SELECT COUNT(*) as total FROM `table` 
WHERE `result` !='2'");
$total = mysqli_fetch_assoc($totalq);
$total_cnt = $total["total"];
$percent = ($success_cnt /$total_cnt ) * 100;

计算总价值的百分比

Calculating Percentage of total value

php

math

mysqli

percentage