(like 'qbqvq' , 'uDJcQBhPBT' , and 'qqbqq' ) to confirm that the injected code is successfully being executed and displayed in the output.
using -- to prevent syntax errors.
Specifically, this string uses the UNION ALL SELECT statement to attempt to: (like 'qbqvq' , 'uDJcQBhPBT' , and 'qqbqq' )