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sql injection "union select null" - CodeProject | To display as

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...

security - Sql injection can someone explain this code... - Stack Overflow

stackoverflow.com

If field is not sanitized, and only if the number of the columns used in the UNION SELECT match with the columns of the query, most likely will appear the string 91351456272.9 somewhere in the page. That will be the confirmed for the attacker of a vulnerability in the page.

Null character - Wikipedia

en.wikipedia.org

The null character (also null terminator or null byte) is a control character with the value zero. It is present in many character sets, including ISO/IEC 646 (or ASCII), the C0 control code, the Universal Coded Character Set (or Unicode), and EBCDIC.

SQL NULL Values - IS NULL and IS NOT NULL

www.w3schools.com

Note: A NULL value is different from a zero value or a field that contains spaces. A field with a NULL value is one that has been left blank during record creation!

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

habr.com

Существуют специальные операторы IS NULL и IS NOT NULL, которые позволяют производить сравнения с NULLами.

999999.9' /**/uNiOn/**/aLl /**/sElEcT null, null, null, null, null, null...

torrentz2.eu

Your search - 999999.9' /**/uNiOn/**/aLl /**/sElEcT null,null,null,null,null,null,null,null and '0'='0 - did not match any documents.

Шпаргалка по SQL инъекциям | DefconRU

defcon.ru

...NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULl, NULL-- Можно использовать CAST

Null pointers

www.ibm.com

A null pointer has a reserved value that is called a null pointer constant for indicating that the pointer does not

Обработка значений NULL | Microsoft Docs

docs.microsoft.com

Значение NULL в реляционной базе данных используется, если значение в столбце неизвестно или отсутствует.A null value in a

NULL (SQL) — Википедия

ru.wikipedia.org

NULL в Системах управления базами данных (СУБД) — специальное значение (псевдозначение), которое может быть записано в поле таблицы базы данных (БД). NULL соответствует понятию «пустое поле», то есть «поле, не содержащее никакого значения».

999999.9" /union/')/**/union/**/all/**/select/**/null,null,null,null,null,null,null,null,null--/**/lmzr/all /select /cast(0x393133353134353632312e39 as char),/cast(0x393133353134353632322e39 as char) and "0"="0 на YouTube:

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