Data Modeling Interview Questions

14 real Data Modeling questions asked in live technical interviews — each with a model answer. Updated weekly.

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These Data Modeling 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.

Will this logic still work if the underlying data schema changes?🟢 Easy · Conceptual · Asked 1×What is the purpose of the load_ts column in this query, and how does it differ from transaction_ts?🟢 Easy · Conceptual · Asked 1×What dimensions do you typically create in a dimensional data model, and how do you decide which dimensions to include?🟡 Medium · Conceptual · Asked 1×If we follow a star schema, will it be better than an optimized or snowflake schema? But that way it will take more space, right? For example, the same data will be repeated multiple times if it is not normalized.🟡 Medium · Conceptual · Asked 1×Which schema design—star or snowflake—provides better query performance, and how does storage impact this choice?🟡 Medium · Conceptual · Asked 1×What is the basic difference between a star schema and a snowflake schema?🟢 Easy · Conceptual · Asked 1×How would you join these two tables, and what would the resulting dataset contain?🟡 Medium · Conceptual · Asked 1×How would you design a time series database for product sales and store data, and how would you retrieve daily, monthly, and weekly summaries?🟡 Medium · Conceptual · Asked 1×Have you heard about the data warehouse model?🟢 Easy · Conceptual · Asked 1×Are you aware of data modeling and data warehouse modeling?🟢 Easy · Conceptual · Asked 1×Why do we use a calendar function?🟢 Easy · Conceptual · Asked 1×Shubhi, the question is simple: When a modeler is giving a proposal to someone, should they structure the table and approach with technical rationale? Which platform are you using? In Databricks, if you are giving someone a model that works on finance data and the requirement is to maintain history, from an implementation point of view, what is the underlying architecture of Databricks?🟡 Medium · Conceptual · Asked 1×Did you work on any data modeling in a timely manner?🟡 Medium · Behavioral · Asked 1×Do you have any idea of a canonical data model?🟡 Medium · Conceptual · Asked 1×

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