Unlock the full course

One payment. Yours forever. You get the interview-critical lessons that the free tier stops short of — the same families of questions hiring teams reuse.

• JOINs — Combine tables. This is where most beginners stall — and what interviews hammer hardest.
• Window Functions — Rank, number, and take running totals without collapsing rows. The skill that 'gets people hired'.
• Subqueries & CTEs — Break a big question into readable steps with a WITH block.
• Interview Patterns — The recurring families real interviews reuse: latest-per-group, better-than-average, top spenders.