The Ultimate SQL Interview Cheat Sheet

Most candidates know SELECT *, but they fail when asked about Window Functions, Gaps and Islands, or Query Optimization.

I am a Software Engineer 3 with over 6 years of experience, and I’ve designed this ultimate guide to be the only SQL resource you need before your technical round. It doesn’t just give you syntax; it gives you the logic required for cracking Tier-1 tech companies.

What you’ll get:

1. Logical Execution Order: Understand how SQL actually 'thinks'.
2. Window Function Mastery: ROW_NUMBER, RANK, LEAD/LAG with real use cases.
3. Cross-Platform Syntax: Comparison tables for PostgreSQL, MySQL, and BigQuery.
4. JSON & Semi-Structured Data: How to handle modern data interview questions.
5. The 'Top 10' Interview Questions: Detailed patterns for Nth Highest Salary, Retention Rate, and more.
6. Performance Tuning: ACID properties, Indexing, and EXPLAIN ANALYZE.

Perfect for:

1. Data Engineers, Backend Devs, and Data Analysts.
2. Candidates prepping for Amazon, Google, or high-growth startups.
3. Anyone tired of Googling syntax mid-interview.