: This command attempts to append a new set of results to the original query's output.
: 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
: 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. : If the number of NULL values does
: 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 represents the original input (like a product category or search term) that the application expects.
The primary goal of this specific syntax is to returned by the original, legitimate database query.
: 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