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Data Warehouse Interview Questions

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

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Okay. What is the difference between a fact and a dimension table?🟢 Easy · Conceptual · Asked 8×Describe the star schema design with one Fact Table (Fact_Sales) and four Dimension Tables (Dim_Customer, Dim_Product, Dim_Date, Dim_Store), including key metrics, granularity, and relationships.🟡 Medium · Conceptual · Asked 1×A client has four source systems: two databases, a daily flat‑file drop, and a RESTful API. They want all data in one warehouse, refreshed before business opens with a dashboard. Nothing exists yet. How would you build it?🔴 Hard · System Design · Asked 1×How many tables were you responsible for, roughly, and how big was the biggest one?🟢 Easy · Behavioral · 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×Do you have experience using Genie? Also, what is a data lakehouse, how does it differ from a traditional data warehouse architecture, and what role does it play?🟡 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×In the recent project you worked on, how did you handle data ingestion from multiple source systems into your data warehouse?🟡 Medium · Behavioral · Asked 1×What is the major difference between a data lake and a data warehouse?🟢 Easy · Conceptual · Asked 1×

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