It looks like your query contains some SQL injection syntax ( SELECT COUNT , CONCAT , INFORMATION_SCHEMA ). If you're looking for an on how these types of database queries work—specifically regarding web security and SQL injection (SQLi) —I can certainly help with that. What is this code?
Only allow the types of characters you expect. If a user is searching for a "Keyword," they probably don't need to use parentheses or semicolons. It looks like your query contains some SQL
These are hexadecimal representations of characters (like 'qbqvq') used as delimiters so the attacker can easily spot their "stolen" data in the middle of a messy error message. Why is it dangerous? It looks like your query contains some SQL