{keyword} Union All Select Null,null,null,null,null,null,null,null-- Ppsq <Limited – SECRETS>

: Attackers use NULL because it is compatible with almost every data type (integers, strings, dates), making it the "safest" way to avoid syntax errors while testing column counts.

: This command attempts to append a new set of results to the original query's output. : Attackers use NULL because it is compatible

The primary goal of this specific syntax is to returned by the original, legitimate database query. : Attackers use NULL because it is compatible

: This represents the original input (like a product category or search term) that the application expects. : Attackers use NULL because it is compatible

The string you provided is a classic payload. It is not a feature of a specific software product but rather a technique used by security researchers and attackers to probe databases for vulnerabilities. Purpose of the Payload