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...
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 of columns as the query it's being merged with, and shifted around the * to make sure the emails are displayed. That's not my question.
10.10.10.134 is our Target! Then run uniscornscan to detect opening ports on the target (unicornscan is much faster than nmap when doing a full ports scan, so here I use it to make a full scan and then use nmap to do a deep scan on target ports).
Validation Rule: Is Not Null - Продолжительность: 2:30 Perins Elearning 10 563 просмотра.
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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.
Специальное значение NULL означает отсутствие данных, констатацию того факта, что значение неизвестно.