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

If the column count is wrong (e.g., the original query has 7 or 9 columns), the database will return an error.

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. If the column count is wrong (e

NULL is used because it is compatible with almost any data type (string, integer, date, etc.), ensuring the query won't fail due to data type mismatches. If the column count is wrong (e

: 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 If the column count is wrong (e

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