Union select null, null, null, null, null, null, null from information_schema.tables. for a small database containing three tables. this instruction is used in sql injection I tried it and it worked but I didn't really know how it works can somebody help me...
';SELECT null,null,null,null,null,null,null,null,null,null, null,null,null,null работает вне зависимости от числа полей в исходном.
UNION ALL SELECT NULL, *, NULL, NULL FROM email. I understand what this does and why; the hacker needs to create a query that has the same number of columns as the query it's being merged with, and shifted around the * to make sure the emails are displayed.
Best Result For : 999999.9 uNiOn aLl sElEcT cAsT 0x393133353134353632312e39 as char --. تفسير فرط السبحة في المنام.
Aynmarie And All The Hanks all char all american woman all booty ann all Dayaanna ... 999999.9 uNiOn aLl sElEcT cAsT 0x393133353134353632312e39 as.
...NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,CONCAT%28version(),0x3a,user
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I think your nitpicking is incorrect: (char*)NULL is a null pointer, but "\0" is an empty string. "" is also an empty string, as is "\0abc".
К нулевому результату первой части запроса (до UNION) присоединился результат второй части (после UNION), вернувшей детальное описание 4-ой новости. Защита от SQL инъекций (SQL внедрений). Защита от взлома сводится к базовому правилу «доверяй, но проверяй».
Если инструкция SELECT используется для тестирования на значения NULL в дополнение к