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

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

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. The payload you provided, ' UNION ALL SELECT

: 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

If the original query has 8 columns, the page will likely load normally or show an extra row of empty data. This specific string is designed to be appended

: Appends a new set of results to the original query's output.

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.