My table has 6 columns, 3 of which I'm interested in: id, name, email. The problem is that my query does care about the name, but doesn't always care about email or id.

As of now, the code is this:

  function get_people( $name, $id = null, $name = null) {

    global $wpdb

    $table_name = $wpdb->prefix . 'my_table';

    $query = "SELECT * FROM $table_name WHERE name='%s'";

    if(!is_null($id)) {
        $query .= "AND id='%s'";
    }

    return $wpdb->get_results($wpdb->query(
        $query,
        $id
    ));
  }

However, WP is telling me this: wpdb::prepare was called incorrectly. The query does not contain the correct number of placeholders (1) for the number of arguments passed (3). Please see Debugging in WordPress for more information. (This message was added in version 4.8.3.)

And, of course, the query looks really ugly and not dynamic at all. If I want changes, it'd be hell to make it work.

Any ideas?