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The WNS Power BI Developer interview involved technical questions on data modeling, DAX, visualization best practices, and SQL. It also assessed problem-solving, business understanding, and communication skills through scenario-based tasks, ensuring both technical expertise and client-oriented mindset were evaluated.
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Power BI Developer

Interviewed at WNS

3.2★
Dec 3, 2025

The WNS Power BI Developer interview involved technical questions on data modeling, DAX, visualization best practices, and SQL. It also assessed problem-solving, business understanding, and communication skills through scenario-based tasks, ensuring both technical expertise and client-oriented mindset were evaluated.

List and describe two different SQL joins? What does UNION do? What errors are in the query below? Missing Group By What is the difference between Where and Having? What is a primary key and a foreign key? How do you determine parent-child account relationships?
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BI Analyst

Interviewed at OpenX

3.8★
Jan 11, 2018

List and describe two different SQL joins? What does UNION do? What errors are in the query below? Missing Group By What is the difference between Where and Having? What is a primary key and a foreign key? How do you determine parent-child account relationships?

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