{keyword}' Union All Select Null,null,null,null,null,null,null,null-- Jynz Official

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

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. The payload you provided, ' UNION ALL SELECT

: Appends a new set of results to the original query's output. The payload you provided