计算总平均评分php

Question

如何计算平均（用户）总评分

示例：用户评分20平均4.3

$result=mysqli_query($connection,"SELECT * FROM rating where to_user_id='".userid."'"); 

计数

$rowcount=mysqli_num_rows($result);
  echo  $rowcount; // Result 20 ratings

评分

   while($row = mysqli_fetch_array($result)){
                    echo  $row['ratting'];// 1.0 2.0 4.0.......

                    ?>

我的问题如何计算总平均值

  example like a total average of 4.3

请帮助我

Answer 1

您可以在MySQL中实现所有这些目标：

SELECT to_user_id, COUNT(rating) AS total_ratings, AVG(rating) AS average_rating FROM rating WHERE to_user_id = 123 GROUP BY to_user_id

echo "{$row['to_user_id']} has an average rating of {$row['average_rating']} from a total of {$row['total_ratings']} rating(s)";

Answer 2

考虑使用mysql AVG函数并按用户分组

SELECT AVG(rating) _avg from ratings group by user;

https://www.w3schools.com/sql/func_mysql_avg.asp

Answer 3

您可以尝试以下方法：

$average = array_sum($row['ratting']) / count($row['ratting']);

print_r($average);

Answer 4

选择（求和（计数）/计数（计数））作为平均FROM评分；

添加分数并对其进行计数，其余部分负责SQL。

Answer 5

如果有帮助，请使用db-fiddle-我们可以直接解决您的问题

Answer 6

您好，您可以使用此功能：-

$result=mysqli_query($connection,"SELECT AVG(rating) as average_rating FROM rating where to_user_id='".userid."'");