回显每组的行数

Question

我有一个 mysql 查询，我在其中按发布日期对每个帖子进行分组。我希望能够回应每天发生的帖子数量，知道方法吗？

这是我到目前为止所写的内容，它确实会在发布的每一天发布一个新的<div>。

$trendQuery = "
SELECT DATE(timestamp) AS ForDate,
    COUNT(*) AS NumPosts
 FROM   trends
 WHERE `trend` = '" . $_GET['graph'] . "'
 GROUP BY DATE(timestamp)
 ORDER BY ForDate
";

$result = mysql_query($trendQuery);
    while ($row = mysql_fetch_array($result)) {
        echo'
        <div>
            <p>Here is where I want to say how many posts that happened!</p>
    </div>
    ';
}

Answer 1

您的查询已基本设置完毕。要回显结果，您只需引用具有别名的列，在您的情况下为 ForDate 和 NumPosts

$trendQuery = "
SELECT timestamp AS ForDate,
    COUNT(*) AS NumPosts
 FROM   trends
 WHERE `trend` = '" . $_GET['graph'] . "'
 GROUP BY timestamp
 ORDER BY ForDate
";

$result = mysql_query($trendQuery);
    while ($row = mysql_fetch_array($result)) {
        echo'
        <div>
            Date: '.$row['ForDate'].' ---- Number of Posts: '.$row['NumPosts'].'<br />
    </div>
    ';

Answer 2

创建趋势查询的视图，并使用“从趋势中选择（您要合并的 ID 或日期）”将其内部连接

希望对你有帮助