SQL interview prep that mirrors real hiring loops

What hiring managers actually test

Most SQL interviews reward clear thinking and correct results, not clever syntax. Expect joins, aggregations, window functions, and a dose of business logic.

A 7-day prep structure

1. Day 1–2: Warm up with SELECT, filters, GROUP BY, and HAVING.
2. Day 3–4: Join patterns — inner, left, and avoiding duplicate inflation.
3. Day 5: Window functions — ROW_NUMBER, running totals, cohort-style questions.
4. Day 6: Time series questions — gaps, retention-style prompts.
5. Day 7: Two timed mocks, verbalize your plan before you type.

During the interview

State your assumptions, sketch the grain of the result set, and validate edge cases (nulls, duplicates, time zones).

When you are ready for implementation support on dashboards, pipelines, or internal analytics tools, email us.