function my_module_views_query_alter(&$view, &$query) {
if ($view->name == 'my_view') {

$node = node_load($nid);
//setting a value from my actual node, into a variable
$field_frequency = $node->field_frequency['und'][0]['value'];

//testing add where function:
  // $papa =  $query->fields['nid']['field'];
  // $query->add_where(0, $papa , '17144', '=');
  // it works!!
//time to compare the field frecuency from my actual node with all the fields from my view

 $view_frecuency = $query->fields['field_data_field_frequency_node_entity_type']['field'];
  $query->add_where(0, $view_frecuency , $field_frequencyday, '=');


  }

}