: This is the SQL comment symbol. It tells the database to ignore everything else in the original code, effectively "turning off" the security checks or logic that were supposed to happen next. The Goal: Data Exfiltration
The text ') UNION ALL SELECT NULL,NULL...-- is a malicious payload used to test for vulnerabilities in a database. : This is the SQL comment symbol
If a website is vulnerable to this, an attacker doesn't just stop at NULL . They eventually replace those NULL s with commands to extract sensitive info—like your —and display them right on the screen where the "Keyword" results should have been. How Developers Stop This : This is the SQL comment symbol