Data & cloud · topic 1 of 2

SQL

Joins, indexes, transactions, query optimization.

Questions below are grouped from foundations to advanced. Work top to bottom if the topic is new to you, or jump to a level if you are brushing up.

Topics covered

Easy · 5 questions

Definitions and building blocks — start here if the topic is new to you.

Medium · 11 questions

The questions most interviews spend their time on: how it works and when to use it.

Hard · 6 questions

Internals, trade-offs and edge cases — useful for senior rounds and follow-ups.

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