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

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 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. This specific string is designed to be appended

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