Day 1: CRUSH the SQL Interview! 11 Must-Know Questions for Data Analysts

Day 1: CRUSH Your Data Analyst SQL Interview! (Full Explanations)

Welcome to Day 1 of my 30-Day Data Analyst Interview Prep Series! In this video, we dive deep into the 11 absolute fundamental SQL questions on data retrieval, filtering, and aggregation. Mastering these basics is essential before moving to complex joins and window functions.

We don't just give answers—we explain the why behind the syntax, covering common pitfalls like the WHERE vs. HAVING mistake and the SQL query execution order.

🎯 11 Specific Questions Covered (Keywords for Search):
1. What does the acronym SQL stand for, and what function does it perform that Excel cannot?
2. Write the exact SQL statement required to return all columns and all rows from a table named Customer_Orders.
3. Write a query to list the ProductName and UnitPrice only where the StockQuantity is less than 50.
4. Explain the operational difference between DISTINCT and GROUP BY.
5. Name the five primary aggregate functions and state one business use case for AVG().
6. Write a query using BETWEEN to count records in the third quarter of 2024.
7. List the six main clauses (SELECT, FROM, WHERE, GROUP BY, HAVING, ORDER BY) in their strict execution order.
8. Explain why the WHERE clause cannot filter aggregates, and which clause must be used instead.
9. Write a query to find the department IDs where the average salary is greater than $60,000.
10. Write a query to retrieve the top 5 highest-priced items, including the keyword for descending order.
11. Write a query using the appropriate operator and wildcard to find EmployeeName containing 'son'.

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