Data Science SQL Interview Questions You Must Know

Dipak Mane

Dec 2, 2023

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SQL query to find nth highest salary/payment or 3rd Highest salary/payment

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How do you optimize SQL queries for performance?

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How do you use the LAG and LEAD functions in SQL? Can you give an example of their use?

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Explain ETL and ELT concept in SQL.

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Can you explain the difference between the WHERE and HAVING clauses in SQL.

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Explain the difference between TRUNCATE, DROP, and DELETE operations in SQL.

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Which is more efficient join or subquery?

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How do you use window functions in SQL?

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Explain Normalization in detail.

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Explain Exclusive Lock and Update Lock in SQL.

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