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What is the difference between star and snowflake schemas? Which one would you choose if you have to build a schema? What id the difference between group by and partition by in SQL? Can you describe any query optimization techniques you have used?
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BI Developer

Interviewed at Cognizant

3.6★
Dec 21, 2020

What is the difference between star and snowflake schemas? Which one would you choose if you have to build a schema? What id the difference between group by and partition by in SQL? Can you describe any query optimization techniques you have used?

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