{keyword} Union All Select Null,null,null,null-- Uizf -

: Once the column count is known, they replace the NULL values with actual commands (e.g., version() , user() , or table_name ) to steal sensitive information.

: The attacker is attempting to determine the number of columns returned by the original database query. By adding NULL values until the page loads without an error, they can identify the table's structure. {KEYWORD} UNION ALL SELECT NULL,NULL,NULL,NULL-- Uizf

: Confirm that the application is vulnerable to SQL injection. : Once the column count is known, they