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

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

: 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 represents the original input (like a

: 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 Why This Matters Once an attacker knows there

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 such as usernames

: 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

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