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.
using -- to prevent syntax errors.
in the original database query (indicated by the repeated 34 ).
The input you provided appears to be a , which is a technique used to exploit vulnerabilities in a database by manipulating a query.
Specifically, this string uses the UNION ALL SELECT statement to attempt to: