I kept all logs from visitors with mySQL. Where it from URL and which URL visit. I found this one.
WYNIKI WYSZUKIWANIA ALBUMÓW - Prodigy SElEcT 1 FRoM SElEcT Count COnCaT SElEcT SElEcT UNhEx HEx COnCaT 0x217e21.
...select-1-from-select-count-concat-select-select-unhex-hex
...concat((select (select concat(0x7e,0x27,unhex(Hex(cast(database() as char))),0x27,0x7e)) from `information_schema`.tables limit 0,1),floor
Since upgrade to MariaDB 5.5.47 (5.5.47+maria-1~wheezy from 5.5.46+maria-1~wheezy) I have crash on only one MySQL server (9 servers with same production
mysql> SELECT CONCAT_WS(',','First name','Second name','Last Name')
Синтаксис: ; (S): SELECT * FROM members; DROP members-- Один запрос закончился
SELECT CONCAT("SQL ", "Tutorial ", "is ", "fun!") AS ConcatenatedString; Try it Yourself ». Definition and Usage. The CONCAT() function adds two or more expressions together.
SELECT CONCAT(hd, ' Gb') volume FROM PC WHERE model=1232