SQL Functions Interview Questions

What are Window Functions and how do they differ from GROUP BY? Advanced
What are aggregate functions in SQL? List commonly used ones. Intermediate
What is the difference between RANK(), DENSE_RANK(), and ROW_NUMBER()? Intermediate
What are string functions in SQL? Provide examples. Intermediate
What are date and time functions in SQL? Provide examples. Intermediate
What are PIVOT and UNPIVOT operations in SQL? Intermediate
What are SQL analytic functions vs aggregate functions? Intermediate
What are SQL mathematical and statistical functions? Intermediate

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