Computer Science · Database Management Systems
निम्नलिखित तीन संबंधों (relations) पर विचार कीजिए: Employee (eid, eName), Comp(cid, cName), Own(eid, cid). निम्नलिखित में से कौन सा रिलेशनल अलजेब्रा एक्सप्रेशन उन eid का सेट लौटाता है जो सभी कंपनियों (cid) के मालिक हैं?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1πeid ( πeid(Own) × ( πcid,cName(Own) ÷ πcid(Comp) ) )
- 2πeid ( πeid,cid(Own) × πcid(Comp) )
- 3πeid ( πeid(Own) × πcid(Comp) )
- 4πeid ( πeid,cid(Own) ÷ πcid(Comp) )✓
सही उत्तर देखें
πeid ( πeid,cid(Own) ÷ πcid(Comp) )
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