That specific text is a common pattern used in . It is designed to trick a database into revealing unauthorized information by joining the results of a legitimate query with a custom set of "null" data [1, 2].
: Appends the results of a second query to the first [3, 4]. {KEYWORD}' UNION ALL SELECT NULL#
SELECT name, description FROM products WHERE category = '{KEYWORD}' UNION ALL SELECT NULL, NULL#'; How it works: : Closes the original data string [2]. That specific text is a common pattern used in
: Acts as a placeholder to match the number of columns in the original query [1, 5]. 4]. SELECT name
: Comments out the rest of the original code so it doesn't cause an error [2].