How to fetch data from database in wordpress?

<table border="1">
    <tr>
     <th>Name</th>
     <th>Phone no.</th>
     <th>city</th>
    </tr>
    <tr>
      <?php
        global $wpdb;
        $result = $wpdb->get_results ( "SELECT * FROM myTable" );
        foreach ( $result as $print )   {
            echo '<td>' $print->firstname.'</td>';
            }
      ?>
    </tr>               
</table>