: Appends a new set of results to the original query's output.
The primary objective of using this payload is . For a UNION operation to work, the injected query must have the exact same number of columns as the original query.
NULL is used because it is compatible with almost any data type (string, integer, date, etc.), ensuring the query won't fail due to data type mismatches. : Appends a new set of results to
If the column count is wrong (e.g., the original query has 7 or 9 columns), the database will return an error.
: This is a SQL comment, which tells the database to ignore the rest of the original, legitimate query that follows. The Goal of the Attack NULL is used because it is compatible with
The payload you provided, ' UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL-- , is a common pattern used in to determine the number of columns returned by an original database query. What this Payload Does
If the original query has 8 columns, the page will likely load normally or show an extra row of empty data. The Goal of the Attack The payload you
This specific string is designed to be appended to a vulnerable input field (the {KEYWORD} in your example) to probe the database structure: : Closes the original string literal in the SQL query.