Forget online tutorials, you want to pick up thick red Wrox SQL books from your local used bookstore or co-op. Nobody selling you anything, densely packed, comp

Forget online tutorials, you want to pick up thick red Wrox SQL books from your local used bookstore or co-op. Nobody selling you anything, densely packed, comprehensive info. SQL has changed very little over the past 25 years, and while there are some syntax variations across different databases, the most important 80+% is universal. Even if the book is for SQL Server the vast majority will work on Postgres, SQLite, etc.