Question: Given two relations: STUDENT ( Student# , D# , Age, Address ) , DEPT ( D# , Name, Chair, Building ) , Consider the following

Given two relations:
STUDENT(Student#, D#, Age, Address),
DEPT(D#, Name, Chair, Building),
Consider the following query optimization issue. Assume that 25% of students are over 30 years old and that there is one department with name CIS. For the following two equivalent queries:
FinalExamQ14.jpg
which one is usually more efficient? Why?

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