如何计算查询 PHP MySQL 中的行? [英] How to calculate rows in query PHP MySQL?

问题描述

我必须在数据库中查询 2 行 sum_hour(double type)

I have to 2 rows of query of sum_hour(double type) in database

第一行 = sum_hour = 2.75

1st row = sum_hour = 2.75

第二行 = sum_hour = 3.00

2nd row = sum_hour = 3.00

它属于 type_move = 'P' 和 (开始日期 >= 2016-11-11 AND end_date <= 2016-11-15)的 2(两个)组 组.代码如下:

It belongs inside 2(two) groups which is type_move = 'P' and (start date >= 2016-11-11 AND end_date <= 2016-11-15) group. The code as below :

<?php
    $sql    = "SELECT  sum_hour,
                    SUM(sum_hour)
                    FROM table
                    WHERE type_move = 'P' AND user_id='username' AND (start_date >= '2016-11-11' AND end_date <= '2016-11-15')
                    GROUP BY sum_hour ";

    $result = mysqli_query($connect, $sql);
    if($result && mysqli_num_rows($result) > 0)
    {
        while($row = mysqli_fetch_assoc($result))
        {   
            $hour = $row['sum_hour'];
            echo " Hours = " .$hour. "<br/>";
            print_r($row);
        }

        echo "Total hours = " .$hour. "<br/>";

    mysqli_free_result($result);
    }
    else
    {
        echo mysqli_error($connect);
    }
?>

输出如下:

小时数 = 2.75

小时数 = 3.00

总小时数 = ?

我的问题是，如何计算上面的 2 行(小时)? 我试图在 phpmyadmin 中运行 sql 语句.它有效，我可以看到总和为 = 5.75，但我不知道如何在浏览器中回显总数

My question is , how to calculate 2 rows (Hours) above ? I tried to run sql statement in phpmyadmin. It work and i can see the value sum up into = 5.75 but i don't know how to echo the total in browser

谢谢.

推荐答案

只需更新您的循环:

$totalHours = 0;

while($row = mysqli_fetch_assoc($result))
    {   
        $hour = $row['sum_hour'];

        $totalHours += $hour;

        echo " Hours = " .$hour. "<br/>";
        print_r($row);
    }

echo "Total hours = " .$totalHours. "<br/>";

您需要将第一个值存储在一个变量中，然后将第二个值与第一个值相加.只需确保可以在循环外读取该值.

You need to store the first value in a variable then add the second one to the first value. Just make sure that the value can be read outside the loop.

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