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Interview experiences & questions tagged Database
What is indexing in databases? Explain how it improves query performance and what happens internally to achieve this efficiency.
Design an AdClick Aggregator Service with a focus on multiple design approaches, including Lambda vs Kappa architecture, database schema design, entity relationships, indexing, and the choice between SQL and NoSQL databases. Justify your choices with real use cases and address concerns around scaling, fault tolerance, and observability.
Design a database schema for a system that manages entities with multiple stages, evaluations, and results over time, supporting repeated attempts and outcomes at different stages. Discuss your design choices and any trade-offs involved.
What are the differences between SQL and NoSQL databases? Why was NoSQL chosen for your current company's tech stack?
Write an SQL query to find the team size of each of the employees. Ensure that your query is optimized for performance.
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