Introduce specialization/generalization concepts into the ER model shown in Figure 13.11 and described in Exercise 12.13 to
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(a) The majority of parking spaces are under cover and each can be allocated for use by a member of staff for a monthly rate.
(b) Parking spaces that are not under cover are free to use and each can be allocated for use by a member of staff.
(c) Up to twenty covered parking spaces are available for use by visitors to the company. However, only members of staff are able to book out a space for the day of the visit. There is no charge for this type of booking, but the member of staff must provide the visitors vehicle license number.
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Database Systems A Practical Approach to Design Implementation and Management
ISBN: 978-0132943260
6th Edition Global
Authors: Thomas Connolly, Carolyn Begg
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