Consider the following two tables where Grades.ID is a foreign key to Students.ID. Students (ID, Name) Grades(ID, Course_No, Grade) Consider the following relational algebra expressions: Expl := TID, Name (Students A Grades) Exp2 := TSnudents.ID, Name (Students x Grades) In the following questions, select whether each query is equivalent to Exp1, Exp2, or Neither.
Consider the following two tables where Grades.ID is a foreign key to Students.ID. Students (ID, Name) Grades(ID, Course_No, Grade) Consider the following relational algebra expressions: Expl := TID, Name (Students A Grades) Exp2 := TSnudents.ID, Name (Students x Grades) In the following questions, select whether each query is equivalent to Exp1, Exp2, or Neither.
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Transcribed Image Text:Consider the following two tables where Grades.ID is a foreign key to Students.ID.
Students (ID, Name)
Grades(ID, Course_No, Grade)
Consider the following relational algebra expressions:
Exp1 := TtID, Name (Students ¤ Grades)
Exp2 := TStudents.ID, Name (Students x Grades)
In the following questions, select whether each query is equivalent to Exp1, Exp2, or
Neither.
Transcribed Image Text:The following RA:
R1:= (Students DA Students.ID = Grades.ID Grades)
R2:= (Students M Students.ID = Grades.ID Grades)
R3:= T Students.ID, Name (R1 N R2)
O Exp1
O Exp2
O Neither
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