DBMS & SQL!

An absolutely mandatory skill for a developer, probably even for a frontend developer (you'll eventually do some backend, Mr. Frontend).

SQL is a fairly simple, declarative language, while Relational Algebra is a different story.

But don't worry, you only need to master SELECTs. (sort of a joke.)

Here you'll also need only practice and practice.

Your default study materials on the topic:

  1. Excellent book by Alan Beaulieu "Learning SQL" (Don't worry that it's old or focused on MySQL. The SQL standard is older and still unchanged.)

  2. SQL problems on HackerRank (medium and hard) or Codewars (6-5-4 kyu)

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