The following set of additional requirements were identified. • The majority of parking spaces are under cover and each can be allocated for use by a member of staff for a monthly rate. • Parking spaces that are not under cover are free to use and each can be allocated for use by a member of staff. 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 space for the day of the visit. There is no charge for this type of booking, but the member of staff must provide the visitor's vehicle license number. Which of the following statements are correct about the EER diagram that includes new requirements? I. ParkingLot and Space will be generalized to a ParkingSpot entity. II. The ParkingLot entity will be specialized into two entities that represent covered and uncovered parking lots. III. The disjoint constraint for the specialization/generalization hierarchy in this scenario will be disjoint.
The following set of additional requirements were identified. • The majority of parking spaces are under cover and each can be allocated for use by a member of staff for a monthly rate. • Parking spaces that are not under cover are free to use and each can be allocated for use by a member of staff. 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 space for the day of the visit. There is no charge for this type of booking, but the member of staff must provide the visitor's vehicle license number. Which of the following statements are correct about the EER diagram that includes new requirements? I. ParkingLot and Space will be generalized to a ParkingSpot entity. II. The ParkingLot entity will be specialized into two entities that represent covered and uncovered parking lots. III. The disjoint constraint for the specialization/generalization hierarchy in this scenario will be disjoint.
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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answer can be multiple answer
Transcribed Image Text:A large organization has several parking lots, which are used by staff.
• Each parking lot has a unique name, location, capacity, and the number of floors (where appropriate).
• Each parking lot has parking spaces, which are uniquely identified using a space number.
• Members of staff can request the sole use of a single parking space. Each member of staff has a unique number, name, telephone
extension number, and vehicle license number.
Staff
Uses
Space
- Provides
ParkingLot
1..1 parkingLotName {PK}
location
staffNo {PK}
0..1
0..1 spaceNo {PK}
1..*
name
extensionTelNo
сарacity
noOfFloors
vehLicenseNo
The following set of additional requirements were identified.
• The majority of parking spaces are under cover and each can be allocated for use by a member of staff for a monthly rate.
Parking spaces that are not under cover are free to use and each can be allocated for use by a member of staff.
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 space for the day of the visit. There is no charge for this type of booking, but the member of staff must provide the visitor's vehicle
license number.
Which of the following statements are correct about the EER diagram that includes new requirements?
I. ParkingLot and Space will be generalized to a ParkingSpot entity.
II. The ParkingLot entity will be specialized into two entities that represent covered and uncovered parking lots.
II. The disjoint constraint for the specialization/generalization hierarchy in this scenario will be disjoint.
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