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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...

Confusing SQL error in SELECT NULL, *, NULL, NULL - Stack Overflow

stackoverflow.com

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

sql - CONCAT'ing NULL fields - Stack Overflow

stackoverflow.com

Now, if I do: SELECT CONCAT(FirstName, LastName, Email) as Vitals FROM MEMBERS.

SQL using If Not Null on a Concatenation - Stack Overflow

stackoverflow.com

Middlename is NULL and OP probably uses Oracle. Although Oracle treats zero-length character strings as nulls, concatenating a zero-length character string with another operand always results in the other operand, so null can result only from the concatenation of two null strings.

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.

SQL ISNULL(), NVL(), IFNULL() and COALESCE() Functions

www.w3schools.com

Look at the following SELECT statement: SELECT ProductName, UnitPrice * (UnitsInStock + UnitsOnOrder) FROM Products

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.

Команда IS NULL - проверка поля на NULL | Трепачёв Дмитрий

old.code.mu

Команда IS NULL проверяет поле на NULL. Пример: SELECT * FROM workers WHERE salary IS NULL.

Нулевые указатели (null и nullptr) в C++ | Уроки С++ - Ravesli

ravesli.com

Как и в случае с обычными переменными, указатели не инициализируются при создании. Если значение не было присвоено, то указатель по умолчанию будет указывать на любой адрес, содержимым которого...

Внедрение SQL-кода — Википедия

ru.wikipedia.org

-1 UNION SELECT group_concat(username, 0x3a, password) FROM admin.

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