{keyword} Union All Select Null,null,null,null,null,null,null,null-- Ppsq [SAFE]

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

: 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 : This represents the original input (like a

: 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

: 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 : This command attempts to append a new

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 ).

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