anchor.diff:          )
       ", [?KEYSPACE, ?TABLE_USER_ROOM]));
   
  +%% ------------------------------------------------------------------
  +%% @doc Create the `room_user` table.
  +%% @end
  +%% ------------------------------------------------------------------
   create_table(room_user) ->
       {ok, Client} = get_cqerl_client(),
       {ok, _} = cqerl:run_query(Client, io_lib:format("
  
positive.code:     }),
      lists:map(fun map_room/1, cqerl:all_rows(Result));
  
  select_room(List) ->
      {ok, Client} = get_cqerl_client(),
      {ok, Result} = cqerl:run_query(Client, #cql_query{
  
negative.code:         ]
      }).
  
  %% ------------------------------------------------------------------
  %% @doc Select an alias.
  %% @end
  %% ------------------------------------------------------------------
  select_alias(#t_alias{} = Alias) ->
      {ok, Client} = get_cqerl_client(),
      {ok, Result} = cqerl:run_query(Client, #cql_query{
  