Specifically, this string uses the UNION ALL SELECT statement to attempt to:
If you are a developer looking to protect your application from this type of attack, the best practice is to use (parameterized queries). This ensures the database treats user input as literal data rather than executable code.
(like 'qbqvq' , 'uDJcQBhPBT' , and 'qqbqq' ) to confirm that the injected code is successfully being executed and displayed in the output. Specifically, this string uses the UNION ALL SELECT
The input you provided appears to be a , which is a technique used to exploit vulnerabilities in a database by manipulating a query.
using -- to prevent syntax errors.