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Let R and S be two relations with the following schemas R (P.Q.R1,R2,R3) and S (P.Q,S1,S₂), where (P. Q) is the primary key for both schemas. Which of the following relational algebra expressions are equivalent? I 11, (RS) II. 11, (R) 11, (S) III. 1 (11, (R), (S)) IV. 11, (1, (R)-(11, (R)-11, (S))) PA I, II, and III I and III IV only I and II O I, III, and IV

Let R and S be two relations with the following schemas R (P.Q.R1,R2,R3) and S (P.Q,S1,S₂), where (P. Q) is the primary key for both schemas. Which of the following relational algebra expressions are equivalent? I 11, (RS) II. 11, (R) 11, (S) III. 1 (11, (R), (S)) IV. 11, (1, (R)-(11, (R)-11, (S))) PA I, II, and III I and III IV only I and II O I, III, and IV

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Let R and S be two relations with the following schemas R (P.Q.R₁,R2,R3) and S (P.Q,S1,S₂), where {P, Q} is the primary key for both schemas. Which of the following relational algebra expressions are equivalent? I. 11, (RS) II. 11, (R) 11, (S) III. (11, (R), (S)) P.Q IV. II, (1, (R)-(11 (R)-11, (S))) P/Q I, II, and III I and III IV only I and II I, III, and IV
Transcribed Image Text:Let R and S be two relations with the following schemas R (P.Q.R₁,R2,R3) and S (P.Q,S1,S₂), where {P, Q} is the primary key for both schemas. Which of the following relational algebra expressions are equivalent? I. 11, (RS) II. 11, (R) 11, (S) III. (11, (R), (S)) P.Q IV. II, (1, (R)-(11 (R)-11, (S))) P/Q I, II, and III I and III IV only I and II I, III, and IV
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