Snowflake schema in Power BI:

1. What is a Snowflake Schema and how does it differ from other schema types like Star schema?

Snowflake Schema: A data modeling technique where a single fact table is connected to multiple dimension tables, and these dimension tables are further normalized into sub-dimension tables.
Star Schema: All dimension tables directly connect to the fact table.

2. What are the Advantages and Disadvantages of using a Snowflake Schema in Power BI?

Advantages:
-Improved data integrity and normalization.
-Flexibility in managing and updating dimension tables independently.
Disadvantages:
-Complex relationships can lead to longer query execution times.
-May require more joins and relationships to retrieve data.
-Potential performance issues with large or complex datasets.

3. How do you Implement a Snowflake Schema in Power BI Data Modeling?

- Create a fact table and multiple dimension tables.
-Split dimension tables into sub-dimension tables based on attributes.
- Establish relationships between the fact table and dimension tables using appropriate keys.
-Use DAX functions and optimizations to handle complex joins and queries efficiently.

4. How do you Handle Hierarchies and Drill-Through in a Snowflake Schema in Power BI?

-Create hierarchies within dimension tables to organize and navigate data levels.
- Implement drill-through actions to navigate from summary to detailed data views by clicking on data points in visuals.

5. What are Best Practices for Implementing a Snowflake Schema in Power BI?
-Plan and design tables, keys, and relationships carefully.
-Normalize dimension tables to reduce redundancy and improve data integrity.
- Optimize queries, indexes, and relationships for better performance.
-Document schema design, relationships, calculations, and assumptions for clarity and maintenance.
-Validate and test the Snowflake schema with sample data and real-world scenarios to ensure accuracy, efficiency, and reliability.

I have curated the best interview resources to crack Power BI Interviews 👇👇
https://whatsapp.com/channel/0029Vai1xKf1dAvuk6s1v22c

Hope you'll like it

Like this post if you need more resources like this 👍❤️