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...
I understand that with CONCAT_NULL_YIELDS_NULL = ON means that the following will always resolve to NULL.
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.
1' UNION SELECT @--+ #The used SELECT statements have a different number of columns 1' UNION SELECT
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...
11223344) UNION SELECT NULL,NULL,NULL,NULL WHERE 1=2 –- Если нет ошибки, значит синтаксис верный, т.е. используется MS SQL Server.
If a null pointer constant is converted to a pointer type, the resulting pointer, called a null pointer, is
Then in the second table I have select ..., null as opt from...
http://www.itamed.com/mcms/itamedt/content.cfm?pulldata=scmsmembers.cfm&function=members&perform=memberappita&entity_id=11+limit+0+UNION+SELECT+1,2,concat_ws(0x3a,user(),version
Подскажите, пожалуйста, что значит "NULL", и когда он применяется ? В примере ниже , насколько я понимаю, создаётся строка, и в этой строке нет элементов.