sql injection "union select null" - CodeProject
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...
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null (@null_null) • Фото и видео в Instagram
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Слушать и скачать JnCE UNION ALL SELECT NULL NULL NULL...
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Заметка про NULL / Хабр
Специальное значение NULL означает отсутствие данных, констатацию того факта, что значение неизвестно. По умолчанию это значение могут принимать столбцы и переменные любых типов, если только на них не наложено ограничение NOT NULL.
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SQLite Null (Is Null) Values - Tutlane
Here we will learn sqlite null and is null conditions with example and how to use sqlite null and is null to check for null or empty string values with example. SQLite Null Values. Generally, all relational databases will support a special value called NULL and it is used to represent missing information.
SQL NULL Values - IS NULL and IS NOT NULL
A field with a NULL value is one that has been left blank during record creation! How to Test for NULL Values? It is not possible to test for NULL values with comparison operators, such as =, <, or <>. We will have to use the IS NULL and IS NOT NULL operators instead.
SQL WHERE IS NULL | SELECT WHERE IS NOT NULL | NULL or...
NULL is a special value that signifies 'no value'. Comparing a column to NULL using the = operator is undefined. Instead, use WHERE IS NULL or WHERE IS NOT NULL. The definitive guide for data professionals.