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.
If the column count is wrong (e.g., the original query has 7 or 9 columns), the database will return an error. The primary objective of using this payload is
: 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 : This is a SQL comment, which tells
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. NULL is used because it is compatible with
: Attempts to select 8 columns of "null" data.
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.