Real questions from top companies in SQL
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?
What are the trade-offs between relational databases and NoSQL for financial data?
What challenges arise with duplicate records, and how do you address them?
What considerations are important when designing a dimensional model for a ridesharing app?
What factors determine the optimal number of partitions for a large file?
What is BigQuery Cache?
What is CTE in SQL?
What is Left Anti Join and its use case?
What is Redshift Spectrum, and how does it differ from standard Redshift queries?
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