(ACM Digital Library).
If you want to practice or learn about this in a controlled environment: -4215) UNION ALL SELECT 34,34#
by Halfond, Viegas, and Orso (IEEE Xplore). (ACM Digital Library)
This is one of the most cited papers in the field. It provides a comprehensive taxonomy of different SQL injection types, including UNION -based attacks like the one in your query. -4215) UNION ALL SELECT 34,34#