Real questions from top companies in SQL · easy
Explain the differences between a Data Lake and a Data Warehouse.
Explain the concept of ACID properties in the context of databases.
Explain Common Table Expressions (CTEs) and their benefits.
Explain the difference between UNION and UNION ALL.
What is the difference between a clustered and non-clustered index?
What is the difference between DELETE and TRUNCATE?
What is a CTE (Common Table Expression)? What are its uses?
Aggregate surface areas and calculate cumulative surface area using the LAG function.
Are you comfortable with the variable pay structure, and what are your expectations for the base salary?
Building ETL pipelines to capture changes when new records are inserted into source tables?
CSV Without Column Names/Schema - how to read
Can CASE statements be used in an UPDATE query?
Can you chain multiple triggers for a single pipeline?
Can you provide a use case where Assert Transformations helped maintain data quality?
Can you share an experience where you resolved a conflict within your team?
Case statement in SQL - explain
Compare Redshift, BigQuery, and Snowflake in terms of cost, performance, and scalability.
Convert row-level records to column records.
Converting SCD0 to SCD3
Count occurrences of each character in a string
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