Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Chapter 4, Problem 1PE

Explanation of Solution

Wrong with the query:

  • The given query is considered to be syntactically correct but it does not compute the answers as expected because for “dept_name” is considered to be an attribute for both “course” and “instructor”.
  • Due to the result of the natural join, the outputs are shown only when the instructor teaches a course in his or her own corresponding department.

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