Draw the ERD in Chen notation corresponding to the following spec: Sailors are identified by an...

Draw the ERD in Chen notation corresponding to the following spec:

Sailors are identified by an sid, having a name, age, and rating
Boats are identified by a bid and also have a name and a color.
Sailors reserve boats on a given date.
Every sailor reserves a boat at some time

Expert Solution

ERD in Chen notation

As per the given requirement and provided details, the Entities of Boat Reservation ERD are:

1. Sailors:-

Attributes of Sailors Entity: sid, name, age and rating

Primary key of Sailors Entity is 'sid', as the entity is identified by the attribute 'sid'.

2. Boats:-

Attributes of Boats Entity: bid, name and color

Primary key of Boats Entity is 'bid', as the entity is identified by the attribute 'bid'.

3. Reservation:- This entity is an entity formed by boats and sailors to make reservation. So it is to be considered as a Weak Entity.

Primary key of Reservation entity is named as 'reserveid' which is formed by bid of Boats and sid of Sailors(So bid and sid will be the foreign keys for this Entity).

ERD for Boat Reservation by Sailors

This ERD is created as per Chen notation. As the Reservation entity is a weak entity it is represented by double rectangle and the discriminator 'reserveid' underlined with a dashed line.

venereology answered 9 months ago

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