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: This command attempts to append a new set of results to the original query's output.
: 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.g., NULL, NULL , then NULL, NULL, NULL ).
: 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
: 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 primary goal of this specific syntax is to returned by the original, legitimate database query.
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
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
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