Real questions from top companies in SQL
Discuss a situation where you had to balance technical priorities and business goals.
Discuss how you handled null values or unstructured data in your previous projects.
Discuss strategies for handling schema evolution in data warehouses.
Does BigQuery support indexes? If not, why?
Does a Common Table Expression store data? If not, how does it function in SQL?
Duplicate characters in a string (e.g., '123a!' to '112233aa!!').
ER Modeling vs. Dimensional Modeling?
Error Handling in T-SQL - TRY...CATCH, THROW, RAISEERROR
Explain BigQuery Architecture.
Explain CTE vs Temp Table. What are the differences and use cases?
Explain Coalesce vs ISNULL. What are the differences in SQL?
Explain Data Modeling SCD Types (Type 1, 2, 3).
Explain Dynamic Partition Pruning error and how to fix it.
Explain ETL process flags and segregation of steps.
Explain Fact Table and Star Schema.
Explain Kafka messaging guarantees and Snowflake schema evolution.
Explain Native vs. External Tables.
Explain Redshift Data Distribution (EVEN, KEY, ALL).
Explain Slowly Changing Dimensions (SCD) and its types
Explain Streams and Tasks in Snowflake.
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