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Consider R(A1,A2,A3,A4,A5, A6) with FDs: F = {A1 - A5, A2 → A1, A3A4 → A5, A5A6 → A2, A3 A4, A5 → A6} Which of the following statements is CORRECT? Note: "F =X → Y" means the FD X -→Y follows from F. Select one: O F=A3 - A, O All of the four statements O None of the four statements O F=A2 → A3 F-A - A4 O F= A5 - A4

Consider R(A1,A2,A3,A4,A5, A6) with FDs: F = {A1 - A5, A2 → A1, A3A4 → A5, A5A6 → A2, A3 A4, A5 → A6} Which of the following statements is CORRECT? Note: "F =X → Y" means the FD X -→Y follows from F. Select one: O F=A3 - A, O All of the four statements O None of the four statements O F=A2 → A3 F-A - A4 O F= A5 - A4

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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Consider R(A1,A2,A3,A4.A5, A6) with FDs: F = {A1 → As, A2 A1, A3A4 → As, AsA6 → A2, A3 → A4, A5 → A6} Which of the following statements is CORRECT? Note: "F =X → Y" means the FD X- Y follows from F. Select one: O F= A3 → A1 O All of the four statements None of the four statements O FEA2 → A3 FEA1 → A4 O FF A5 → A4
Transcribed Image Text:Consider R(A1,A2,A3,A4.A5, A6) with FDs: F = {A1 → As, A2 A1, A3A4 → As, AsA6 → A2, A3 → A4, A5 → A6} Which of the following statements is CORRECT? Note: "F =X → Y" means the FD X- Y follows from F. Select one: O F= A3 → A1 O All of the four statements None of the four statements O FEA2 → A3 FEA1 → A4 O FF A5 → A4
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