"Do not use the reporting tool to do what the database engine does better." Databases are optimized for sorting, filtering, aggregating, and joining. PDF engines are optimized for pagination, fonts, and vector graphics. Keep the responsibilities separated.
Martin Gruber’s Understanding SQL is widely regarded as a canonical text for learning the Structured Query Language (SQL). Unlike many modern tutorials that focus solely on syntax or specific proprietary software (like MySQL or SQL Server), Gruber’s work provides a deep, conceptual understanding of the relational model and how SQL interacts with it. This report details why this specific book remains a relevant and "better" resource for those seeking to master database logic rather than just memorizing commands.