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Which of the following relational alzebra queries correct representation to retrieve Eid’s of female employees whose salary more than all male employees of the company over database relation Emp (Eid, Salary, Sex)

how can q3 be correct according to me division will try to to mach eid to eid but we have renamed eid of male to I hence it wont find any match

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Himanshu Kashyap asked Jan 12, 2019
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PLEASE EXPLAIN WHEATHER IT WOULD BE SOME EC DEPARMENT OR ALL EC DEPARTMENT I THINK ALL BECOZ IT IS SELECTION EID OF STUDENT WHO HAVE NOT ENROLLED IN ANY COURSE OF EC