Computer Science · Database Management Systems
Consider the following three relations: Employee (eid, eName), Comp(cid, cName), Own(eid, cid). Which of the following relational algebra expressions returns the set of eids who own all companies (cids)?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1πeid ( πeid,cid(Own) ÷ πcid(Comp) )✓
- 2πeid ( πeid(Own) × πcid(Comp) )
- 3πeid ( πeid,cid(Own) × πcid(Comp) )
- 4πeid ( πeid(Own) × ( πcid,cName(Own) ÷ πcid(Comp) ) )
Correct answer
πeid ( πeid,cid(Own) ÷ πcid(Comp) )
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