Referring a particular display in Drupal's Hook Views Query Alter

The documentation of this function does not tell us how to alter a particular display, probably they thought we'll figure it by ourselves... anyway... in the $view object we have a member named current_display which is actually a string representing as you guessed the current display.

Now when you want to alter only one display you can  write something like this:

function [your_module_name]_views_query_alter(&$view, &$query) {
        if (($view->name == '[view_name]') && ($view->current_display == '[display_name]')) {

                 //do something

        };
}