获取两列和几行之间的平均时间MYSQL [英] Get average time between two columns and several rows MYSQL

问题描述

我有两列，一列包含开始时间戳，另一列包含结束时间戳.我想计算所有记录的开始和结束之间的平均时间.目前我尝试了以下方法:

I have two columns one containing a start TIMESTAMP and one containing a END TIMESTAMP. I want to calculate the average time between start and end over all records. Currently I tried the following:

$result = $conn->query( $sql );

$averages = array();

$result = $conn->query( $sql ); # Place the result into an array
if ( $result->num_rows > 0 ) {
    while ( $row = $result->fetch_assoc() ) {


            $sum = 0;

        if($EndColumn == ' '){
            $time = $row[$StartColumn];

        }else{
        $time = strtotime($row[$EndColumn]) - strtotime($row[$StartColumn]);    

            $averages[] = $time; 
         }

        }
    $total = array_sum($averages);

    $count = count($averages);

        $avg = $total/$count;
    return round(($total/$count));

这根本无法正常工作，我认为这可以在 sql 字符串本身中完成，但太愚蠢了无法弄清楚.无论哪种方式，请帮助！

This is not working correctly at all, I think this can be accomplished in the sql string itself but am too stupid to figure it out. Either way please help!

推荐答案

请试试这个:

   SELECT CAST(AVG(start_date + (IFNULL(end_date,start_date)-start_date)/2) AS DATETIME) AS average_date FROM TableName

如果日期存储为时间戳，则上述查询将给出所有记录的开始和结束之间的平均时间.

If dates are stored as timestamp then above query will give average time between start and end over all records.

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