What potential issues can arise from relying on IDs for counting registered users in a database?

One potential issue that can arise from relying on IDs for counting registered users in a database is the presence of gaps in the ID sequence. This can occur if rows are deleted from the database, causing the IDs to become non-contiguous. To accurately count the number of registered users, it is better to use a COUNT query on the users table instead of relying on the IDs. 

// Get the count of registered users from the database
$query = "SELECT COUNT(*) as total_users FROM users";
$result = mysqli_query($connection, $query);
$data = mysqli_fetch_assoc($result);
$total_users = $data['total_users'];

echo "Total registered users: " . $total_users;

Keywords

SQL injection data integrity primary key constraints auto-increment duplicate entries

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