SQL Interview Cheat Sheet Bundle | Subqueries, Window Functions, Query Patterns & Performance Tuning

Walk into your SQL interview confident — not cramming Stack Overflow at midnight.

This 4-sheet Interview Kit covers the advanced SQL topics that actually show up in technical interviews: subqueries, CTEs, window functions, classic query patterns, and performance tuning.

What's included (4 PDF sheets):

📄 Sheet 4 — Subqueries & CTEs (2 pages)
Subquery basics, WHERE/FROM/SELECT subqueries, correlated subqueries, CTEs, and a clear Subquery vs. CTE comparison so you always know which to reach for.

📄 Sheet 5 — Window Functions (2 pages)
ROW_NUMBER, RANK, DENSE_RANK, LAG/LEAD, aggregate window functions, moving averages, frame clauses, and chaining multiple CTEs.

📄 Sheet 6 — Classic Interview Query Patterns (3 pages)
The patterns interviewers actually test: Nth highest salary, top-N per group, duplicate detection, running totals, self-joins, month-over-month growth, gap-and-island streaks, pivot/conditional aggregation, and EXISTS vs IN vs JOIN.

📄 Sheet 7 — Performance & Indexing (2 pages)
How indexes work, index types, when to index, clustered vs non-clustered, covering indexes, composite index column order, index seek vs scan, EXPLAIN/EXPLAIN ANALYZE, slow query patterns, and optimization tips.

Who is this for?
✅ Developers and analysts prepping for technical interviews
✅ Career switchers moving into data or backend engineering
✅ Anyone who passed the basics but wants to level up fast
✅ Self-taught coders who skipped the advanced stuff

Format: Instant digital download — 4 PDF files, print-ready or screen-friendly.

Want the full set? Pair this with the Starter Pack (Sheets 1–3) for complete SQL coverage from basics to interview-ready.