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

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

: 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.

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 The primary goal of this specific syntax is

: 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

: 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 It is not a feature of a specific

: This represents the original input (like a product category or search term) that the application expects.

: This command attempts to append a new set of results to the original query's output. Why This Matters : This represents the original

Once an attacker knows there are 8 columns, they can replace the NULL values with commands to extract sensitive data, such as usernames, passwords, or database versions. SQL injection UNION attacks | Web Security Academy