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

If the page returns an error (like "The used SELECT statements have a different number of columns"), the attacker will try again with five or seven NULL values until the error disappears. 4. -- (The Comment) In SQL, double-dashes signify the start of a comment.

: Any code that was supposed to follow the input (like a closing quote or a WHERE clause) is ignored by the database, preventing syntax errors that would break the injection. 5. GoJB

: NULL is used because it is compatible with almost any data type (integers, strings, dates, etc.). If the page returns an error (like "The

: The database returns a row of empty data. The attacker now knows the table has 6 columns and can proceed to more dangerous injections, such as UNION SELECT username, password, NULL... to steal sensitive information.

: The attacker wants the database to return the results of the original query plus the results of their injected query. : Any code that was supposed to follow

: The database executes: SELECT col1, col2, col3, col4, col5, col6 FROM products WHERE name = '' UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL--' .

If the page loads normally, the attacker knows the database is expecting 6 columns. : The database returns a row of empty data

Here is a detailed breakdown of what each component of this specific string does: 1. {KEYWORD}