INTERVIEW QUESTIONS DATABASE SQL DETAILS

Question: Explain UNION, MINUS, UNION ALL and INTERSECT?

Answer: INTERSECT - returns all distinct rows selected by both queries. MINUS - returns all distinct rows selected by the first query but not by the second. UNION - returns all distinct rows selected by either query UNION ALL - returns all rows selected by either query, including all duplicates.

INTERSECT - returns all distinct rows selected by both queries. MINUS - returns all distinct rows selected by the first query but not by the second. UNION - returns all distinct rows selected by either query UNION ALL - returns all rows selected by either query, including all duplicates. Source: CoolInterview.com

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