I would think you'd want to use a more mature/complete SQL database, with broader documentation and a larger community, to learn about SQL. MySQL or PostgreSQL, would be the obvious free choices. Unless you specifically want to learn about client-side browser-based SQL databases (which is a pretty specific niche of SQL database), in which case this would be interesting, but possibly not extremely relevant to development work you'd be doing today, since it is so new.

But a more mature/complete SQL database mostly write in c/c++, and the old design is very complex and hard to change.