An attacker (or security researcher) would send this payload to an application to see if it returns an error or a successful response.
: This command combines the result set of the original query with a new set of data. UNION ALL is used instead of UNION because it is often faster and does not remove duplicates, which can be useful for certain types of data extraction.
For more in-depth technical guides, you can visit the Web Security Academy or community forums like Medium .
: The number of NULL values (5 in this case) does not match the number of columns in the original table.