LeetCode SQL: The Problem-Solving Guide

Tired of staring at SQL interview questions and not knowing where to start?

This guide teaches you the 10 patterns that cover 95% of all SQL interview questions — from FAANG to startups. Instead of memorizing 200 solutions, you learn to recognize the pattern in secondsand apply the right template every time.

According to Google's Gemini, this book is highly rated at a 9.5/10 for data engineer interview preparation, regardless of experience level.

What's inside:

- 7 SQL building blocks explained with depth, analogies, and progressive examples

- 10 battle-tested problem-solving patterns with recognition triggers and templates

- 62 fully-worked LeetCode problems with step-by-step reasoning (not just answers)

- Every solution in PostgreSQL — the industry standard

- Pattern Recognition sections that train your instinct, not just your memory

- Difficulty progression from Easy → Medium → Hard within each pattern

- Edge cases, common traps, and alternative approaches for every problem

Who this is for:

- Data Engineers, Data Analysts, Backend Engineers and anyone preparing for SQL interviews

- Anyone who can write basic SELECT/WHERE but struggles with Medium/Hard problems

- People who've done 50+ LeetCode problems but still can't solve new ones without hints