Question

我正在执行此查询以了解按日期计算的唯一IP数。事实是，我需要在PHP中返回按日期划分的唯一IP数量，以及日期本身。我该怎么办？

function getTotUniqueVisitsDay($id) {
    $query="SELECT COUNT(DISTINCT user_ip) FROM campaigns_visitors WHERE campaign_id = ".$id." group by date";
    $result = mysql_query($query) or die("Getting tot unique visits by day failed: " . mysql_error());   
    $visits_by_day = mysql_num_rows($result);
    return $visits_by_day;   
}

Answer 1

您的查询是

SELECT COUNT(DISTINCT user_ip)
FROM campaigns_visitors
WHERE campaign_id = ?
GROUP BY date

这不会像您找到的那样返回date。

你应该有更多运气

SELECT COUNT(DISTINCT user_ip), date
FROM campaigns_visitors
WHERE campaign_id = ?
GROUP BY date

其他人可能会建议您使用预准备语句和mysqli例程;我已经帮助您将查询翻译成可以准备的格式。

我相信你可以构造PHP来操作改变的语句。

Answer 2

最佳做法是将日期存储为last_updated和date_created列。这篇文章建议如何获取任何表的更新日期 How can I tell when a MySQL table was last updated?

并且根据以下帖子，您无法获得表格中特定行的更新日期 How to get the date of record updating in MySQL

Answer 3

function getTotUniqueVisitsDay($id) {
    $query="SELECT date_field FROM campaigns_visitors WHERE campaign_id = ".$id." group by date_field";
    $result = mysql_query($query) or die("Getting tot unique visits by day failed: " . mysql_error());   
    $visits_by_day = mysql_num_rows($result);
    $visits_by_day['count'] = count($visits_by_day);
    return $visits_by_day;   
}

mySQL根据日期和返回日期选择DISTINCT ips

3 个答案: