Question

我正在为我运行的服务编写统计脚本。我想计算过去3天，每周，每月和每年的平均每天行数。我的基本思想是这样的，以获得平均值：

<?php
function getDayNumber($day)
{
    $start = strtotime("last monday");
    $q = mysql_query(sprintf("SELECT COUNT(*) as count FROM mytable WHERE dayname(datetime) = "%s" AND unix_timestamp(datetime) > %s",$day,$start));
    $row = mysql_fetch_assoc($q);
    return $row['count'];
}

$monday = getDayNumber("Monday");
$tuesday = getDayNumber("Tuesday");
$wednesday = getDayNumber("Wednesday");
$thursday = getDayNumber("Thursday");
$friday = getDayNumber("Friday");

$average = ($monday+$tuesday+$wednesday+$thursday+$friday)/5;

?>

以上只是从我脑海中写下的伪代码。我不能想出一个更好的方法。

这可以通过嵌套/加入查询来实现吗？我需要能够每天，每周，每月......等基础上进行。我想如果我能找到一种方法来提取MySQL中的所有数据，我可以将所有 count（*）组合在一起并通过响应数量来划分它们。

这可行吗？

感谢任何帮助 - 谢谢大家！

Answer 1

我建议找到每个数据集的日期范围，然后运行查询。希望这会有所帮助。

<?php
/**
 * Get the average number of rows that were created
 * during the given date range.
 * 
 * @param  string    $range    The date range to look for
 * @return integer             The average number of rows created in the given range
 */
function getAverageRows($range)
{
    $date_begin = null;
    $date_end   = null;

    switch($range)
    {
        case 'year':
            // Calculate the beginning and end datetime of the past year
            $date_begin = FIRST_DAY_OF_YEAR . ' 00:00:00';
            $date_end   = LAST_DAY_OF_YEAR  . ' 23:59:59';
        break;

        case 'month':
            // Calculate the beginning and end datetime of the past month
            $date_begin = FIRST_DAY_OF_MONTH . ' 00:00:00';
            $date_end   = LAST_DAY_OF_MONTH  . ' 23:59:59';
        break;

        case 'week':
            // Calculate the beginning and end datetime of the past week
            $date_begin = FIRST_DAY_OF_WEEK . ' 00:00:00';
            $date_end   = LAST_DAY_OF_WEEK  . ' 23:59:59';
        break;

        default:
            // Calculate the beginning and end datetime of the past three days
            $date_begin = SEVENTY_SIX_HOURS_AGO;
            $date_end   = now();
        break;
    }

    $query = "SELECT COUNT(*) FROM mytable WHERE datetime >= '{$date_begin}' AND datetime <= '{$date_end}'";

    // Get and return query results
}

echo "Average Rows:<br/>";
echo "Past three days: " . getAverageRows()        . "<br/>";
echo "Past week: "       . getAverageRows('week')  . "<br/>";
echo "Past Month: "      . getAverageRows('month') . "<br/>";
echo "Past Year: "       . getAverageRows('year')  . "<br/>";

平均多行的数字，按天选择

1 个答案: