DATABASE SYSTEM CONCEPTS LCPO
DATABASE SYSTEM CONCEPTS LCPO
7th Edition
ISBN: 9781265586577
Author: SILBERSCHATZ
Publisher: MCG
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Chapter 3, Problem 32E

Explanation of Solution

Query:

The query for the given scenario:

SELECT distinct teaches.ID, Name FROM takes, teaches, instructor WHERE teaches.course_id = takes.course_id AND instructor.Id = teaches.Id and Grade is not NULL AND teaches.ID not in (SELECT distinct teaches.Id FROM takes, teaches WHERE teaches.course_id = takes.course_id and Grade="A");

Explanation:

  • The subquery(inner select query) finds teacher Id's who have given Grade "A" in any course that they teach...

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