php - 回显查询的最旧时间戳

Question

对于这个简单的查询，如何回显最旧的 loginid 的 datecommented 时间戳(以分钟为单位)？

$queryuidcount = "select loginid, datecommented from comment where (HOUR(NOW()) -       HOUR(datecommented)) <= 1 and loginid = '$uid'"; 
$uidresult = mysql_query($queryuidcount);

Answer 1

您可以要求 MySQL 按特定顺序提供行:

  SELECT loginid, datecommented 
    FROM comment 
   WHERE (HOUR(NOW()) - HOUR(datecommented)) <= 1 
     AND loginid = '$uid' 
ORDER BY datecommented ASC
   LIMIT 1 -- use this if you only want 1 row (ie: the oldest row)

MySQL Reference: Sorting Rows