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In this video, I've explained one of the most commonly asked SQL interview questions at Amazon using LEAD() and LAG() ...

Apache Spark has levels to it: - Level 0 You can run spark-shell or pyspark, it means you can start - Level 1 You understand the ...

Check out this simple roadmap that I followed to master SQL...

Content: • Window function ≠ GROUP BY • Keeps original rows • Uses OVER() clause • Used for running total, moving average ...

Welcome back to logical kanika! In this video, we're diving deep into one of the most powerful yet misunderstood concepts in SQL ...

Confused about SQL UNION, UNION ALL, and INTERSECT? Not sure when to use which? In this video, I break them down with ...

Subscribe & Comment 'sql' i will send you complete details and also will send you complete SQL checklist for Data Analyst ...

In this video, we'll solve one of the most frequently asked PySpark interview questions — “How to find the Top N records per group ...

Ready to build your first SQL table? In this video, we'll walk through the SQL CREATE TABLE command step by step—perfect for ...

Window functions and aggregate function window function and aggregate function. Optimization technique so.

Master SQL Aggregate Functions! In this video, I'll break down COUNT, SUM, MIN, MAX, and AVG with easy-to-follow examples.

1️⃣ JOIN logic (not syntax) What they ask • Difference between INNER, LEFT, RIGHT JOIN • Which join to use and why What ...

5️⃣ Window functions don't reduce rows ROW_NUMBER() keeps rows. GROUP BY reduces rows. Confusing these changes ...

Show me: • Window functions • CTEs • Business queries Then we talk. #SQL #HiringTruth.

1️⃣ SQL comes FIRST (no debate) Most data analyst jobs work directly with databases. SQL is used daily, Python is not.

... SQL joins interview questions, advanced SQL interview questions, SQL case study questions, SQL window functions interview ...

Content: • Don't use MAX() twice blindly • Use DENSE_RANK() for cleaner solution • Handles duplicate salaries properly ...