{keyword} Union All Select Null,null,null,null,null,null,null,null-- Ppsq May 2026

: This is a SQL comment marker that tells the database to ignore the rest of the original query, preventing errors from leftover code. How it Works

: 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). : This is a SQL comment marker that

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 It is not a feature of a specific

: This represents the original input (like a product category or search term) that the application expects. : An attacker starts with one NULL and keeps adding more (e

The primary goal of this specific syntax is to returned by the original, legitimate database query.

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