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A comment on Ask HN: Which DB internals to study more to become expert in DBs overall??.
Once you finish the major papers, CMU has a ton of talks from more recent database research projects: https://db.cs.cmu.edu/seminar2020/
You could also try building a simple database from scratch, like this: https://www.awelm.com/posts/simple-db/
Also if you are specifically interested in SQL, make sure to learn relational algebra/calculus.
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Once you finish the major papers, CMU has a ton of talks from more recent database research projects: https://db.cs.cmu.edu/seminar2020/
You could also try building a simple database from scratch, like this: https://www.awelm.com/posts/simple-db/
Also if you are specifically interested in SQL, make sure to learn relational algebra/calculus.