O'Reilly has an excellent pocket book on generic SQL titled "SQL Pocket Guide: A Guide to SQL Usage" (it has several editions). That book worked really well fo

O'Reilly has an excellent pocket book on generic SQL titled "SQL Pocket Guide: A Guide to SQL Usage" (it has several editions). That book worked really well for me. It is surprisingly thorough for a pocket book. I highly recommend it. Besides that, I highly recommend https://sqlite.org/ https://sqlite.org/ as a reference. It's syntax pages for SQL are fantastic. But to understand the language you need a better resource, and for my money that's the book mentioned above.