Databases Interview Questions

17 real Databases questions asked in live technical interviews — each with a model answer. Updated weekly.

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These Databases interview questions were captured from real interviews by candidates using Assisting AI. Each links to a full model answer. For real-time help during your own interview, get Assisting AI from ₹500/day.

Suppose you have a dataset with 10 million rows and need to run a complex query that aggregates data from multiple tables. How would you optimize the query for better performance?🟡 Medium · Conceptual · Asked 1×How do you optimize slow running SQL queries?🟡 Medium · Conceptual · Asked 1×Are you familiar with window functions? Can you explain any window function you have used in real time?🟡 Medium · Conceptual · Asked 1×Assume you have a product table. How would you schedule a daily refresh at 5:00 UTC?🟡 Medium · Conceptual · Asked 1×Will you schedule drops in Snowflake? Can you explain one approach you can use to schedule Snowflake objects?🟡 Medium · Conceptual · Asked 1×Do you identify slow running queries?🟡 Medium · Conceptual · Asked 1×Do you know the difference between hash and range partitioning?🟡 Medium · Conceptual · Asked 1×Given two tables A and B, can you write the number of rows that would result from an inner join, a left join, and an outer join?🟡 Medium · Conceptual · Asked 1×What measures would you take to ensure that a script handles data securely, especially when connecting to databases and APIs?🟡 Medium · Conceptual · Asked 1×Did you work on any data modeling in a timely manner?🟡 Medium · Behavioral · Asked 1×What are the advantages of PostgreSQL? Why would you choose DynamoDB over other databases like SQL Server?🟡 Medium · Conceptual · Asked 1×Why use DynamoDB? What are its use cases?🟢 Easy · Conceptual · Asked 1×In which SQL databases have you had hands‑on experience?🟢 Easy · Behavioral · Asked 1×Can you explain in simple terms the advantage of NoSQL? I don't want a complex definition.🟢 Easy · Conceptual · Asked 1×Can you write an SQL snippet to output data from a dataset?🟡 Medium · Coding · Asked 1×Are you able to write queries?🟢 Easy · Conceptual · Asked 1×Will a partition be based on region, occupation, and amount?🟡 Medium · Conceptual · Asked 1×

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