SQL

Can you clarify how a left join, a right join, and a union are different from each other in SQL operations?

Also asked as "How would you distinguish between left join, union, and right join in the context of SQL queries?"

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1 answer published. Last candidate submission on Feb 25 2026, 12:01pm PDT. Interview question asked to Data Scientists interviewing at SurveyMonkey, ByteDance, Confluent and other companies. Original question asked: Can you clarify how a left join, a right join, and a union are different from each other in SQL operations?. Question last reported by a candidate interviewing at Meta for a Data Scientist interview on Aug 11 2024, 12:54pm PDT.