🔥 Top 10 Theoretical Interview Questions Every Data Analyst Must Prepare 📊

Data Analyst interviews are not just about writing SQL queries — interviewers also test your understanding of core concepts across different tools.

1️⃣ What is the difference between WHERE and HAVING clauses in SQL?
2️⃣ Explain the difference between INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN.
3️⃣ What are Primary Keys and Foreign Keys? Why are they important in databases?
4️⃣ What is the difference between VLOOKUP, XLOOKUP, and INDEX-MATCH in Excel?
5️⃣ What is the difference between a Series and a DataFrame in Pandas?
6️⃣ How do you handle missing values in a dataset?
7️⃣ What is the difference between calculated columns and measures in Power BI?
8️⃣ Explain the difference between Power Query and DAX in Power BI.
9️⃣ Explain the difference between ETL and ELT.
🔟 What is the difference between correlation and causation?

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