SQL 50 Interview Queries

💡 I failed my first Data interview, not because I didn’t know Spark, Hadoop, or ML… but because I couldn’t write a simple SQL query.

The interviewer’s question was simple 👉 “Find the second-highest salary from an employee table.”

But I blanked out.

That day, I realized → If you want to crack 20+ LPA Data offers, SQL isn’t optional.

Here’s the roadmap that helped me rebuild myself 👇

➡️ Foundations → SELECT, WHERE, GROUP BY, ORDER BY

➡️ Joins → INNER, LEFT, RIGHT, FULL

➡️ Aggregations → COUNT, SUM, AVG, HAVING

➡️ Subqueries & CTEs → cleaner, smarter queries

➡️ Window Functions → RANK, ROW_NUMBER, PARTITION BY

➡️ Performance Tuning → indexing & optimization

With this roadmap, I turned my rejection around & got my breakthrough!

Today, though, you don’t have to follow the same path: Rejections → Lessons → Offers. A senior SDE can guide you at every step from Day 1 to help you get top offers🚀

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