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prior to answer number 2 to 5

prior to answer number 2 to 5

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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prior to answer number 2 to 5

Specification Functional Dependency 1. Consider the relational schemas given below and the respective sets of functional dependencies valid in the schemas. For each one of the relational schemas identify its highest normal form. Remember that the identification of a normal form requires analysis of the valid functional dependencies and the minimal keys. Provide justification of each answer. A solution with no comprehensive justification scores no marks. i. R1(A, B, С, D, E, F, G, H) F%3D {CH — G,A — ВС, Е — А,F — EG} ii. R2 = (S,C,L, D) F = {(L,D) → S, (L, D) → C,L → D} R3(A,B,C,D,E) F = {ABC → D, D → A}
Transcribed Image Text:Specification Functional Dependency 1. Consider the relational schemas given below and the respective sets of functional dependencies valid in the schemas. For each one of the relational schemas identify its highest normal form. Remember that the identification of a normal form requires analysis of the valid functional dependencies and the minimal keys. Provide justification of each answer. A solution with no comprehensive justification scores no marks. i. R1(A, B, С, D, E, F, G, H) F%3D {CH — G,A — ВС, Е — А,F — EG} ii. R2 = (S,C,L, D) F = {(L,D) → S, (L, D) → C,L → D} R3(A,B,C,D,E) F = {ABC → D, D → A}
2. In a higher education institution, in a semester, students are allowed to enroll up to 2 running subjects, and each running subject may have many students enroll to it. The final grade the students receive for a subject, and the credit value of each subject are recorded in the following relational table. ENROLMENT(StdNum, SubNum, Grade, CreditValue) 3. When a staff is required to undertake an inspection of properties, the staff is allocated a company car for the day. A staff may inspect several properties on a given date, and a property is only inspected once on a given date. This information of the inspection are stored in the following relational table: PropertyInspection(PropertyNum, IDate, ITime, Comments, StaffNum, CarRegNum) 4. In a company, employees involved in many projects, and each project may have many employees working on it. The number of hours each employee works in each project, and the start date on which the employee starts working on the project are capture in the following relational table. EmployeeProject (EmpeNum, ProjNum, HoursWork, DateStartWorkOnProj) 5. Each student is assigned with a counselor who will act as an advisor to the students. The student is given the counselor email address so that the student can contact the counselor for advice. The information on the student and counselor are stored in the following relational table. STUDENTCOUNSELOR (StdNum, StdName, CounselorName, CounselorEmail)
Transcribed Image Text:2. In a higher education institution, in a semester, students are allowed to enroll up to 2 running subjects, and each running subject may have many students enroll to it. The final grade the students receive for a subject, and the credit value of each subject are recorded in the following relational table. ENROLMENT(StdNum, SubNum, Grade, CreditValue) 3. When a staff is required to undertake an inspection of properties, the staff is allocated a company car for the day. A staff may inspect several properties on a given date, and a property is only inspected once on a given date. This information of the inspection are stored in the following relational table: PropertyInspection(PropertyNum, IDate, ITime, Comments, StaffNum, CarRegNum) 4. In a company, employees involved in many projects, and each project may have many employees working on it. The number of hours each employee works in each project, and the start date on which the employee starts working on the project are capture in the following relational table. EmployeeProject (EmpeNum, ProjNum, HoursWork, DateStartWorkOnProj) 5. Each student is assigned with a counselor who will act as an advisor to the students. The student is given the counselor email address so that the student can contact the counselor for advice. The information on the student and counselor are stored in the following relational table. STUDENTCOUNSELOR (StdNum, StdName, CounselorName, CounselorEmail)
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