Alp Consulting Data Analyst Interview Questions and Answers

Q1. SQL Related Questions
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Q2. What are the joins in SQL?
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Joins in SQL are used to combine rows from two or more tables based on a related column between them.
• Joins are used to retrieve data from multiple tables based on a related column between them

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• INNER JOIN returns rows when there is at least one match in both tables

• LEFT JOIN returns all rows from the left table and the matched rows from the righ...read more
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Q3. How to improve the Query performance?
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Improving query performance involves optimizing database design, indexing, and query structure.
• Optimize database design by normalizing tables and reducing redundant data.

• Use indexes on columns frequently used in queries to speed up data retrieval.

• Avoid using SELECT * and instead specify only the necessary columns in the query.

• Optimize query structure by avoiding nested queries and using efficient join methods.

• Consider ...read more
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Q4. Scenario based questions?
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Scenario based SQL questions and how to improve our sales.