If you are looking for academic research on this topic, you might be interested in papers covering:
The specific syntax you provided ( UNION ALL SELECT 34,'qbqvq'||'uCXRWiFuos'||'qqbqq',34... ) is a common technique used in security testing to: in a database table. Identify which columns can display string or numeric data. If you are looking for academic research on
: Research on signature-based detection for payloads containing concatenated strings like 'qbqvq'||'uCXRWiFuos' . If you are looking for academic research on
: Techniques like prepared statements and parameterized queries. If you are looking for academic research on
Assistance with for a legitimate data analysis project. Set Operators - UNION (Transact-SQL) - Microsoft Learn
Information on against these types of queries.
: How automated tools detect these specific UNION -based patterns.