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sql injection "union select null" - CodeProject

www.codeproject.com

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...

Casting NULL to a struct pointer in C? - Stack Overflow

stackoverflow.com

The standard NULL can be defined as0 or 0L or ((void *) 0) or in some other way, meaning that it might be interpreted differently in such type-less contexts. An explicit cast will make sure that it is interpreted correctly as a pointer. For example, this is generally invalid (behavior is undefined).

Шпаргалка по SQL инъекциям | DefconRU

defcon.ru

11223344) UNION SELECT NULL,NULL,NULL,NULL WHERE 1=2 –- Если нет ошибки, значит синтаксис верный, т.е. используется MS SQL Server.

libinjection/sqli-misc.txt at master · client9/libinjection · GitHub

github.com

...Concat((select+%28SELECT+concat%280X7E%2C0X27%2CUNHEX%28HEX%28CAST

Заметка про NULL / Хабр | select col from ttt where col is not null

habr.com

Соответственно, IS NOT NULL действует наоборот: вернёт истину, если значение операнда отлично от NULLа и ложь, если он является NULLом

tokokita-sql.txt | Vulners Database

vulners.com

site = $ARGV[0]; $path = $ARGV[1]; $sqlinj = "union+ select+ null, null, null, concat(0x6b3174,email,0x316e), null, concat(0x6b3474,password,0x307574), null, null, null, null, null+ from+ user_admin/*"; $expl = "http://" . $site . $path . "barang.php?produk_id=-9+" .

Внедрение SQL-кода — Википедия

ru.wikipedia.org

1.3 Использование UNION + group_concat(). 1.4 Экранирование хвоста запроса. 1.5 Расщепление SQL-запроса.

25 примеров команды SELECT в MySQL | ИТ Блог.

andreyex.ru

SQL - Класс union. SQL - Значение NULL.

Null-Null – Wiktionary

de.wiktionary.org

Referenzen und weiterführende Informationen: [1] Duden online „Null_Null“. [*] canoonet „Null-Null“.

UPDATE (Transact-SQL) - SQL Server | Microsoft Docs

docs.microsoft.com

Также может использоваться для присвоения значения NULL, если столбец не имеет

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