php - 使用MySQL计数函数

Question

我想计算所有用户记录并将其显示在表格中，我正在尝试这段代码，它仅显示一个用户的记录，我想显示所有用户的记录。

$u=$_POST['userid'];

$result1 = mysqli_query($con,"SELECT COUNT(user_id) as total FROM table-name where user_id=$u");

echo "<table border='1'>

</tr>

<tr>

<th>User ID</th>

<th>count</th>

</tr>";

while($row = mysqli_fetch_array($result1))
  {
  echo "<tr>";
 echo "<td>" . $u . "</td>";
  echo "<td>" . $row['total'] . "</td>";
   echo "</tr>";
  }
echo "</table>";
}

Answer 1

尝试以下 SQL 查询:

SELECT `user_id`, COUNT(`user_id`) as `total` FROM `table-name` GROUP BY `user_id`;

请参阅 GROUP BY 的文档条款。