The Ultimate SQL Interview Preparation Guide for Big Tech

Prepare for SQL interviews by learning how to think — not just memorizing queries.

The SQL Interview Questions – Premium Big Tech Interview Kit is a comprehensive interview-preparation handbook built for Data Analysts, Analytics Engineers, BI Engineers, Data Engineers, Data Scientists, and other SQL-heavy roles.

Inside, you'll get 30 carefully designed SQL interview challenges, progressing from medium to advanced difficulty and based on realistic business scenarios across e-commerce, advertising, cloud, streaming, marketplaces, customer analytics, and more.

📘 What you'll practice

The handbook covers a wide range of SQL concepts, including:

Window Functions • ROW_NUMBER • RANK • DENSE_RANK • NTILE • LEAD & LAG • Running Totals • Rolling Windows • JOINs • SELF JOINs • UNION & UNION ALL • Subqueries • Correlated Subqueries • CTEs • Recursive CTEs • EXISTS • Conditional Aggregations • CASE WHEN • Date Functions • String Manipulation • NULL Handling • GROUP BY • HAVING • Tie-Breaking • Time Windows • Advanced Analytical Patterns

All solutions use PostgreSQL.

🎯 Every question includes

🗂️ Table Structure — understand the schema and sample data

❓ Interview Question — a realistic business problem

📊 Expected Output — know exactly what the query should return

💬 Clarifying Questions & Answers — learn what to ask before coding

🧠 Step-by-Step Thought Process — understand how to approach the problem

✅ PostgreSQL Answer — a complete SQL solution

📖 Detailed Explanation — understand how and why the query works

💡 Key Insights — remember the concepts that matter

⚡ Performance Optimization Tips — think beyond simply getting the right answer

🚫 Common Candidate Mistakes — learn what to avoid

🎯 Big Tech Interview Tip — practical advice for technical interviews

🎁 BONUS: FREE 30-minute 1:1 call

Your purchase also includes a complimentary 30-minute 1:1 call with me.

Use the session to discuss your SQL interview preparation, career questions, interview strategy, or areas where you want additional guidance.

Instructions for arranging the call are included in the handbook.

🚀 More than a collection of SQL answers

The objective isn't simply:

Question → SQL Query

It's:

Understand the data → Clarify the problem → Define the expected result → Build your approach → Write the SQL → Explain your reasoning → Optimize → Learn from common mistakes

Because in a technical interview, writing a correct query is only part of the challenge.

30 SQL challenges. One complete interview-preparation handbook. Plus a 30-minute 1:1 session.