meaning of the double lines arc

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
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(b) The club plans to introduce a family membership scheme so that children of
members can use the club's facilities. Children will have the same trainers and
registered locations as their parents, so the only extension to the ER diagram
looks like this (note that the attributes of Member are not shown):
Member
Has
Child
Name
(i) Explain the meaning of the double lines around the Has relationship and the
Child entity.
[2]
(ii) Specify the table that must be added to the database. Clearly indicate primary
keys and foreign key constraints.
Transcribed Image Text:(b) The club plans to introduce a family membership scheme so that children of members can use the club's facilities. Children will have the same trainers and registered locations as their parents, so the only extension to the ER diagram looks like this (note that the attributes of Member are not shown): Member Has Child Name (i) Explain the meaning of the double lines around the Has relationship and the Child entity. [2] (ii) Specify the table that must be added to the database. Clearly indicate primary keys and foreign key constraints.
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