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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...

Using UNION SELECT Error Based

github.com

select `4` from (select 1,2,3,4,5,6 union select * from users)dbname; Injection example inside the query select author_id,title

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

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.

NULL pointer in C - GeeksforGeeks

www.geeksforgeeks.org

If a null pointer constant is converted to a pointer type, the resulting pointer, called a null pointer, is guaranteed to compare unequal to a pointer to any object or function.”

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.

COUNT, DISTINCT, and NULLs - SQL with Bert

bertwagner.com

returns non null values in group */ SELECT COUNT(Col1) FROM ##TestData; Because of this, COUNT, DISTINCT, and NULLs have a special relationship with each other that isn’t always as intuitive as many people think. Whenever using COUNT or DISTINCT, make sure to test with NULLs to make...

Внедрение SQL-кода — Википедия

ru.wikipedia.org

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

SQL NULL Values - IS NULL and IS NOT NULL

www.w3schools.com

The IS NULL operator is used to test for empty values (NULL values). The following SQL lists all customers with a NULL value in the "Address" field

Обработка значений NULL - ADO.NET | Microsoft Docs

docs.microsoft.com

Если инструкция SELECT используется для тестирования на значения NULL в дополнение к другим, она должна включать предикат IS NULL:If a

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