Consider the following three relations in a relational database: Employee(eId, Name), Brand(bId, bName), Own(eId, bId) Which of the following relational algebra expressions returns the set of eIds who own all the brands?

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Computer Science · Database Management Systems

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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Correct answer

ΠeId(Own) - ΠeId((ΠeId(Own) × ΠbId(Brand)) - ΠeId, bId(Own))

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Answer 1

ΠeId(ΠeId, bId(Own) / ΠbId(Brand))

Answer 2

ΠeId(Own) - ΠeId((ΠeId(Own) × ΠbId(Brand)) - ΠeId, bId(Own))

Answer 3

ΠeId(ΠeId, bId(Own) / ΠbId(Own))

Answer 4

ΠeId((ΠeId(Own) × ΠbId(Own)) / ΠbId(Brand))

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