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1. Consider the following relations, where the primary keys are underlined. ? Student (sid, sname, age, mentor_sid) ? Enroll (eid, cid) ? Course (cid, cname,

1. Consider the following relations, where the primary keys are underlined. ? Student (sid, sname, age, mentor_sid) ? Enroll (eid, cid) ? Course (cid, cname, semseter) Let S be Student, let E ...

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