[英]Returning each unique user from a MySQL table and also the count of the number of rows for each user
我正在使用以下MySQL查询来为数据库中的用户生成一个表。 该查询旨在为每个用户只返回一行,即使每个用户有多个行也是如此。 这可以正常工作,但是我还需要计算每个用户的唯一条目数,以进入表中显示HERE的表。 我是否需要使用另一个查询来返回所有条目的计数,如果是的话,如何将其与已有的代码集成在一起?
$query="SELECT from_user, COUNT(*) AS num FROM tracks GROUP BY from_user ORDER BY COUNT(*) DESC";
$result=mysql_query($query) or die(mysql_error());
while ($row = mysql_fetch_array($result)) {
$user = $row['from_user'];
echo "<tr>";
echo "<td>".$user."</td>";
echo "<td>uploads (**HERE**)</td>";
echo "<td>favourites (count)</td>";
echo "</tr>";
}
?>
</table>
因为您已经创建了自定义字段'num',所以可以使用它来获取计数!
在user = ...
之后添加以下行
$count = $row['num'];
那么你也能
echo "<td>uploads ($count)</td>";
它想念你的表stucture知道你的字段名,但是,如果我也明白你的问题,你可以使用count + 不同的 MySQL中。 您也可以检查此答案 。
SELECT DISTINCT(from_user) AS user,
COUNT(from_user) AS num
FROM tracks
GROUP BY from_user
ORDER BY num DESC";
对于第二个问题,您可以进行第二个查询,或进行连接跟踪。
我认为,就您而言,您更容易在循环内进行第二次查询以从“用户”结果中获取所有详细信息。
$query1="SELECT DISTINCT(from_user), COUNT(*) AS num
FROM tracks
GROUP BY from_user
ORDER BY COUNT(*) DESC";
$query2="SELECT * FROM tracks";
$result1=mysql_query($query1) or die(mysql_error());
$result2=mysql_query($query2) or die(mysql_error());
$user_array = array();
while ($row = mysql_fetch_array($result1)) {
$user = $row['from_user'];
$num = $row['num'];
$uploads_array = array();
while ($sub_row = mysql_fetch_array($result2)) {
if( $sub_row['from_user'] == $user ) {
//for example only due to the unknown structure of your table
$uploads_array[] = array(
"file_name" => $sub_row['file_name'],
"file_url" => $sub_row['file_url']
);
}
}
$user_array[] = array(
"name" => $user,
"num_entry" => $num,
"actions" => $uploads_array
);
}
// now the table with all data is stuctured and you can parse it
foreach($user_array as $result) {
$upload_html_link_arr = array();
$user = $result['name'];
$num_entry = $result['num_entry'];
$all_actions_from_user_array = $result['actions'];
foreach($all_actions_from_user_array as $upload) {
$upload_html_link_arr[] = sprintf('<a href="%s">%s</a>', $upload["file_url"],$upload["file_name"]);
}
$upload_html_link = implode(', ',$upload_html_link_arr);
$full_row = sprintf("<tr><td>%s</td><td>uploads : %s</td><td>favourites (%d)</td></tr>", $user, $upload_html_link, $num_entry);
// now just echo the full row or store it to a table for the final echo.
echo $full_row;
}
我希望能有所帮助,迈克
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