Data Warehousing Interview Questions

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

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These Data Warehousing 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.

Which is SCD type 2. What is its behavior?🟢 Easy · Conceptual · Asked 10×Implement SCD Type 2 by closing the old row and inserting a new row for every address change, using effective dates to track history.🟡 Medium · Coding · Asked 1×A daily load needs to insert rows that are new and update rows that already exist. How do you implement this?🟡 Medium · Conceptual · Asked 1×When implementing slowly changing dimensions, how do you decide whether to count changes that occur within seven days versus those that occur after seven days? Also, can you walk through the SQL syntax you would use for handling SCD type 2?🟡 Medium · Conceptual · Asked 1×If a downstream analyst says a dashboard is slow because a query over your Redshift or a thinner layer is scanning far too much data, how would you diagnose and optimize that end‑to‑end?🟡 Medium · Conceptual · Asked 1×What about Snowflake? Have you experienced Snowflake as well?🟢 Easy · Conceptual · Asked 1×What is the difference between a star schema and a snowflake schema? Do you use them?🟡 Medium · Conceptual · Asked 1×Data is stored as facts and dimensions. What are fact and dimension tables?🟢 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×How would you implement logic for three ordered tiers (Bronze, Silver, Gold) in a target table?🟡 Medium · Conceptual · Asked 1×What are the different types of dimensions in dimensional modeling?🟡 Medium · Conceptual · Asked 1×In a previous design, a view was built to directly query data from S3, causing slowdown. How did you address this performance issue?🟡 Medium · Debugging · Asked 1×Can you design and implement a system that can extract data from APIs and load it into an S3 bucket or a posted location, given that you have to deal with complex and large data volumes from various API systems, including social media and other API systems?🔴 Hard · System Design · Asked 1×

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