BEGIN
    if not exists (select 1 from view_aggregates where object_id = new.object_id) then 
        INSERT  INTO view_aggregates (object_id,views_count,unique_views,last_viewed) 
        VALUES (new.object_id,1,1,now());
    else
        UPDATE view_aggregates 
           SET views_count = views_count + 1, unique_views = unique_views + 1, last_viewed = now() 
         WHERE object_id = new.object_id;
    end if;

    return new;
END;