{keyword} Union All Select Null,null,null,null,null,null,null,null-- Ppsq -

: If the number of NULL values does not match the original query's column count, the server usually returns an error (like a 500 Internal Server Error).

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 : If the number of NULL values does

: An attacker starts with one NULL and keeps adding more (e.g., NULL, NULL , then NULL, NULL, NULL ). Purpose of the Payload : An attacker starts

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

: When the number of NULL s matches exactly (in your case, 8 columns), the page will load normally or show an extra blank row, confirming the database structure. Why This Matters

: 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.