Ask HN: Building a relational database system for educational purposes?

Ask HN: Building a relational database system for educational purposes?
2 by debo_ | 1 comments on Hacker News.
If I wanted to build a compiler for fun, I can think of several good, practical books that I could follow along with to do so. Can any of you recommend something similar for relational databases? I'm interested in writing some potentially restricted subset of SQL, with some query planning + optimization. If it ended up being a toy version of sqlite, I would be quite satisfied. Thank you!

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