post 값은 잘넘어가는데 sql 업데이트가 안되는거같아요

<form method='post' action='golf_adm_time_check_schedule_Action.php' enctype='multipart/form-data'>...생략 <td>        <input type='hidden' name='residx' value='<?=$l['residx'];?>'>        <select name='status' id='status' >        <option value='0' <?=$l['status'] =='0' ? "selected":"";?>>입금대기</option>        <option value='1' <?=$l['status'] =='1' ? "selected":"";?>>입금완료</option>        <option value='2' <?=$l['status'] =='2' ? "selected":"";?>>취소</option>        </select>    </td>            <td>              <input type='submit' value='수정' >            </td>...생략</form> <?    include_once "_common.php";     sql_query("UPDATE reserved_data SET             status = '".$_POST['status']."'            where idx = '".$_POST['residx']."'");        echo"        <script>        alert('수정완료');        parent.location.href='golf_adm_check_schedule.php';        </script>        ";?>