php - mysql one field by different priority ordering -


i have table having pay_mode field in subscription,onetime,free entries, want fetch record on subscription,onetime random order , free listing on descending order(not random) date. 

   $this->db->select("p.*", false);                      $this->db->from($this->table_classified." p");    $this->db->where('p.is_active', '1');    $this->db->where('p.is_deleted', 'no');     $this->db->order_by("(case `pay_mode`             when 'recurring' 3             when 'onetime' 2             when 'free' 1          end)",'desc');     $this->db->order_by('pay_mode', 'random');    $query    = $this->db->get();

please find schema here

you can write custom query on codeigniter , can fetch recurring , onetime random use union , fetch free listing desc order. 

 $query = "(select *         (select nc_classified.*,                      nc_classified_category.title_zh cat_title_zh,                      nc_classified_category.title    cat_title                 `nc_classified`                      left join `nc_classified_category`                             on nc_classified.cat_id = nc_classified_category.id                ( $where )                      , `pay_mode` in( 'recurring', 'onetime' )               order  ( case `pay_mode`                             when 'recurring' 1                             when 'onetime' 2                           end ),                         rand()) a)      union      (select *         (select nc_classified.*,                      nc_classified_category.title_zh cat_title_zh,                      nc_classified_category.title    cat_title                 `nc_classified`                      left join `nc_classified_category`                             on nc_classified.cat_id = nc_classified_category.id                ( $where )                      , `pay_mode` in( 'free' )               order  id desc) a) ";     $cquery = $this->db->query($query);

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