{keyword} Union All Select Null,null,null,null,null,null,null,null-- Ppsq ❲UHD❳

: 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

: 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. : This is a SQL comment marker that

: 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

The primary goal of this specific syntax is to returned by the original, legitimate database query. : This is a SQL comment marker that

: 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