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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 ...

This SQL Interview Question is one of the most frequently asked questions in MNC interviews for freshers and experienced ...

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Why WHERE and HAVING are NOT the same in SQL? Most people use WHERE and HAVING but don't understand how SQL ...

Your SQL can be correct and still be a red flag. In this video I walk through common SQL antipatterns I see in code reviews, show ...

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Your query runs… but your answer is wrong ❌ • WHERE vs HAVING confusion • Filtering before vs after aggregation • Wrong ...

How do you make a set of $700 speakers sound like they were bought at Walmart? Tune in to find out!

Confused about SQL data types? This video explains SQL data types in a simple and beginner-friendly way. In this video, you will ...

Many SQL developers and even experienced engineers make mistakes while using Foreign Keys — not because the concept is ...

DDL commands in SQL are one of the most confusing topics for beginners. In this video, I explain DDL (Data Definition Language) ...

Are you starting your journey in Data Analytics and feeling confused about where to begin? I've been there.In this video, I honestly ...

Here's the real reason 1️⃣ Knowing syntax is not enough Most people memorize: • Joins • Group By • Window functions But ...

Welcome to our exploration of SQL object naming, where we unravel the conditions and rules for precision in defining your ...

Most developers fail system design interviews not because they don’t know scaling — but because they don’t design for failure ...

PART 1 — UNDERSTAND WHAT INTERVIEWS ACTUALLY TEST Most people prepare SQL the wrong way. They try to memorize ...

9 SQL HOOKS NO ONE TELLS YOU 1️⃣ COUNT(*) ≠ COUNT(column) COUNT(*) counts rows. COUNT(column) skips NULLs.