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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

mysql - Return 0 when SELECT COUNT is null - Stack Overflow

stackoverflow.com

SELECT m.id, m.name, m.description, m.directions, COUNT(j.markerid) as marker_jingles FROM markers AS m LEFT OUTER JOIN jingles AS j ON j.markerid=m.id WHERE 1. But am a bit stuck because I cannot figure out how to get it to return rows when the COUNT is 0.

sql - COUNT(*) Includes Null Values? - Stack Overflow

stackoverflow.com

This includes NULL values and duplicates. How can you have a null value in a group? Can anyone explain the point they're trying to make?

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

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

Null value in column "name" violates not-null constraintDETAIL: Failing...

forum.rockstor.com

The first to see what might of happened here, the ‘null’ name bit, is the following command

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.

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

IS NULL (Transact-SQL) - SQL Server | Microsoft Docs

docs.microsoft.com

expression IS [ NOT ] NULL. АргументыArguments.

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