jquery delete 'select option' element value except the second option value

Question

how can i delete the value of each select option element except the second option value :

<select name="_users_id_requester" onchange="submit()">
  <option value="0">-----</option>
  <option selected="" value="774">Asmaa El Habib,Yassine</option>//except this one 
  <option value="779" title="Ahlam Edouiri - U8K8O">Ahlam Edouiri</option>
  <option value="746" title="Ainane Mohamed - MohamedAinane">Ainane Mohamed</option>
</select>

i have tried some thing like this but i don't know how to end it :

$("select[name='_users_id_requester']").each(function(){
  if ( $(this).index() > ..... )
    $(this).attr("value", " ");
});

Answer 1

You can go like

$("select[name='_users_id_requester'] option").not(":eq(1)").val('');

Answer 2

$("select[name='_users_id_requester'] option").not(":eq(1)").prop('value', '');