计算时间戳记少于24小时的行 [英] Counting rows where a timestamp is less than 24 hours old

问题描述

对于以下查询，我该如何计算datesent少于24小时的行数? (字段datesent是时间戳).

For the query below, how could I count the number of rows where datesent is less than 24 hours old? (The field datesent is a timestamp).

预先感谢

约翰

  $message = "SELECT datesent, recipient
               FROM privatemessage 
              WHERE recipient = '$u'";


  $messager = mysql_query($message);

$messagearray = array(); 

推荐答案

使用:

SELECT COUNT(*) AS cnt
  FROM PRIVATEMESSAGE pm
 WHERE pm.datesent >= DATE_SUB(NOW(), INTERVAL 1 DAY)

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