How I can run this query in grocery crud?

Hello, good day, Sorry for my bad English, I'm Spanish
How I can run this query in grocery crud?

select mcu.usuario,lin.celular
from mc_usuarios mcu,linea lin
where mcu.id!=lin.idusu

I need that every time I select a figure and finish choose to terminate the registration did not reappear se-lected the data that had previously when registering another tuple.

source code

public function linea()
   {
       try{

           $crud = new grocery_CRUD();

           $crud->set_theme('flexigrid');

           $crud->set_table('linea');


           $crud->set_subject('Linea');

           $crud->set_language('spanish');

           $crud->display_as('idusu','Usuario');
           $crud->set_subject('Linea');

           $crud->set_relation('idusu','mc_usuarios','usuario');

           $output = $crud->render();
           $this->_example_output($output);
       }catch(Exception $e){

           show_error($e->getMessage().' --- '.$e->getTraceAsString());
       }

}

How I can run this query in grocery crud?

DandyJK