Real questions from top companies in SQL
Schema Design: Star vs. Snowflake schema differences
Snowflake Tech Stack: Deployment on Azure, cluster sizing considerations, and overall data warehouse design?
Strategies for working with busy team leads?
Tasks where the candidate faced failure and lessons learned.
Tell us about a project where you optimized an existing process or pipeline. What was the impact?
Teradata to Hadoop migration and handling data with SCD Type 2?
Test SQL skills using advanced window functions such as LAG, LEAD, and DENSE_RANK.
Time and cost comparisons for executing the same query in Snowflake and Spark.
Two tables: Table 1 has 8 records, Table 2 has 2 records, common column id. How many records would result with Inner Join, Left Join, Right Join, Full Outer Join?
Use cases for internal staging in Snowflake?
Using Airflow to trigger and manage ETL jobs?
What are Assert Transformations, and where are they used?
What are BigQuery Slots?
What are Slowly Changing Dimensions (SCD), and how would you implement them for tracking customer data changes?
What are partitioning strategies in Redshift?
What are some best practices for writing efficient SQL queries?
What are the benefits of BigQuery Warehouse?
What are the benefits of using a cloud data warehouse (e.g., Redshift, Snowflake) for analytics?
What are the differences between normalization and denormalization? When would you use a denormalized structure?
What are the key design principles for a cloud-based data warehouse?
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