person ID пате address employee student salary tot_credits instructor secretary rank hours_per_week Figure 8.9 Specialization and generalization.

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 the E-R diagram in Figure 8.9, which contains specializations, using
subtypes and subtables. Give an SQL query to find the names of all people who are not secretaries.

person
ID
пате
address
employee
student
salary
tot_credits
instructor
secretary
rank
hours_per_week
Figure 8.9 Specialization and generalization.
Transcribed Image Text:person ID пате address employee student salary tot_credits instructor secretary rank hours_per_week Figure 8.9 Specialization and generalization.
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