Is [CLASS_CODE, CLASS_NAME, STU_NUM, STU_NAME] a Superkey? Why? Is [CLASS_CODE, CLASS_NAME, STU_NUM] a Superkey? Why? Is [CLASS_CODE, CLASS_NAME, STU_NUM] a Candidate Key? Why? Is [CLASS_CODE, STU_NUM] a Candidate Key? Why?

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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Question

Consider the following Table for the entity ENROLL:

CLASS_CODE

CLASS_NAME

STU_NUM

STU_NAME

ATTENDANCE

ENROLL_GRADE

10014

INFO3233-01

321452

Jan Jones

 30/35 Classes

C

10014

INFO3233-01

324257

Tom Poole

 25/35 Classes

B

10018

INFO3234-01

321452

Jan Jones

 35/35 Classes

A

10018

INFO3234-01

324257

Tom Poole

 30/35 Classes

B

10021

INFO3236-01

321452

Jan Jones

 35/35 Classes

C

10021

INFO3236-01

324257

Tom Poole

 20/35 Classes

C

  1. Is [CLASS_CODE, CLASS_NAME, STU_NUM, STU_NAME] a Superkey? Why?
  2. Is [CLASS_CODE, CLASS_NAME, STU_NUM] a Superkey? Why?
  3. Is [CLASS_CODE, CLASS_NAME, STU_NUM] a Candidate Key? Why?
  4. Is [CLASS_CODE, STU_NUM] a Candidate Key? Why?

Please label your answers (for #1, 2, 3, or 4) clearly.

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