SQL Interview Questions PDF
Struggling to get your SQL chops up to speed for data science interviews? You’re not alone—and you’re in luck.
This PDF book, SQL Interview Questions for Data Scientists, is your no-fluff, code-first, hands-on guide to mastering SQL in the context that actually matters: real-world data problems.
We’re not just tossing syntax at you—we’re training you to think in SQL.
Whether you’re breaking into data science, shifting from BI to ML, or brushing up before the big FAANG interview, this book will sharpen your querying instincts with:
- Real business scenarios – e-commerce analytics, churn prediction, user engagement, and more.
- Fully explained SQL questions – from basic SELECTs to advanced window functions.
- Pro tips and gotchas – the stuff hiring managers love asking, but tutorials always skip.
- Cross-platform syntax tips – MySQL, PostgreSQL, SQL Server, Oracle... we’ve got you covered.
- Best practices for readable, optimized queries – because clean SQL is the new clean code.
What’s Inside the Book?
Here’s the breakdown of what you’ll get in these pages:
- SQL Basics Refresher – SELECT, WHERE, ORDER BY, LIMIT... don’t skip this if you’ve been on a NoSQL bender.
- Aggregations & Grouping – SUM, COUNT, AVG, GROUP BY, HAVING… and how to use them like a pro.
- JOINs – Inner, Outer, LEFT, RIGHT, and how to stitch datasets together without losing your sanity.
- Subqueries & CTEs – Because sometimes one query just isn’t enough.
- Window Functions – RANK, ROW_NUMBER, moving averages, and time-based magic.
- Data Cleaning with SQL – Null wrangling, deduping, standardizing dates—all the messy bits.
- Exploratory Data Analysis (EDA) – Slice, dice, summarize. Know your data before you model it.
- Feature Engineering with SQL – Lag features, categorical binning, aggregations—you’ll feel like a wizard.
- Real-World Case Questions – Multi-step challenges to simulate actual take-home tests and interviews.
- SQL Optimization & Performance – Write fast queries that don’t melt your database.
- Platform-Specific SQL Dialects – Understand what changes when you jump from PostgreSQL to BigQuery.
- Interview Strategy & Best Practices – Ace the conversation around your queries, not just the syntax.
- Mock Interview & Take-Home Exercises – Test yourself with practical problems, just like in the real world.
Why You’ll Love This Book
This isn’t a “just memorize this query” type of book. It’s a toolkit for:
- Thinking like a data scientist
- Communicating like a pro in interviews
- Writing SQL that’s readable, scalable, and production-ready
Whether you're prepping for an interview or solving hairy data problems at work, this book helps you build muscle memory for writing SQL that works.
Ready to go from SELECT * to SELECTED for the job?
Grab the book, start writing smarter queries, and become the data scientist who doesn’t break a sweat when someone says “let’s JOIN that.”
PDF File