WP Function to view Data from Custom Table

function view_etries(){
    global $wpdb;
    echo "<div class='contact-admin'>";
    echo "<h1>Form Entries</h1>";
    $mainTable = $wpdb->prefix . "contact_table";
    @$query = $wpdb->prepare("SELECT * FROM $mainTable WHERE %d >= '0'", RID);
    $entries_forms = $wpdb->get_results($query);
    echo "<table class='table table-bordered'  style='width: 100%; text-align: left;'>
            <thead>
                <tr>
                    <th>Page Name</th>
                    <th>Name</th>
                    <th>Email</th>
                    <th>Phone</th>
                    <th style='display:none;'>Home Select</th>
                    <th style='display:none;'>Price</th>
                    <th>Select Builder</th>
                    <th>Comment</th>
                    <th>Newsletter Subscribe?</th>
                </tr>
            </thead>";
    foreach ( $entries_forms as $entries_form ) {
        if($entries_form->newsletter=='on'){
            $newsletter = 'Yes';
        }else{
            $newsletter = 'No';
        }
        echo "<tr><td>$entries_form->page_name</td><td>$entries_form->title_name $entries_form->full_name</td><td>$entries_form->email</td><td>$entries_form->phone</td><td style='display:none;'>$entries_form->home_select</td><td style='display:none;'>$entries_form->home_price</td><td>$entries_form->selected_builder</td><td>$entries_form->comment</td><td>$newsletter</td></tr>";
        //echo $entries_form->id . " " . $entries_form->name . " " . $entries_form->email . " " . $entries_form->phone . " " . $entries_form->comment . "<br/>";
    }
    echo "</table></div>";
}