Real questions from top companies in SQL
Write an SQL query to find duplicate emails in a users table.
Triggers in ADF, especially tumbling window triggers.
What is a CTE (Common Table Expression)? What are its uses?
What is a window function? Explain with an example.
What is the difference between OLTP and OLAP?
Write a SQL query to find top 3 earners in each department.
Write a query to find the top three highest-paid employees in each department using window functions.
Write complex SQL queries involving multiple joins, subqueries, and data aggregation logic.
Are you comfortable with the variable pay structure, and what are your expectations for the base salary?
CSV Without Column Names/Schema - how to read
Cloud Architecture - explain
Compare Airflow's @daily vs once trigger scheduling.
Compare OLTP and OLAP systems in the context of financial transactions.
Compare PostgreSQL vs Snowflake. How do they handle duplicate record errors?
Compare Redshift, BigQuery, and Snowflake in terms of cost, performance, and scalability.
Compare the star schema and snowflake schema. Which one would you use for reporting at Swiggy, and why?
Connecting BigQuery with Linux
Consolidate hotel reviews and create a dashboard. Design a data model for the reviews.
Converting SCD0 to SCD3
Create Spark Session, read CSV, join, and write as table. Provide example code.
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