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Given the following SQL query: Employee( eId , Name) Brand( bId , bName) ...
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Given the following SQL query:
Employee(eId, Name) Brand(bId, bName)Own(eId, bId)
SELECT O1.eId FROM Own O1 WHERE NOT EXISTS ( SELECT B.bId FROM Brand B WHERE NOT EXISTS ( SELECT * FROM Own O2 WHERE O2.eId = O1.eId AND O2.bId = B.bId ) );
Which of the following Relational Algebra expressions correctly represents this query?
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