{keyword}' Union All Select Null,null,null,null,null-- Bwmv File

: The attacker is trying to determine how many columns the original database table has. If the number of NULL values doesn't match the number of columns in the original query, the database will return an error. By adding or removing NULL s, an attacker can find the exact table structure.

: This is the core of the attack. It tells the database to append the results of a second query to the results of the first one. {KEYWORD}' UNION ALL SELECT NULL,NULL,NULL,NULL,NULL-- bWmV

: This ensures the database treats input as data only, never as executable code. : The attacker is trying to determine how