Mapping Relationships and Cardinalities
Defining meaningful relationships is a very important step in the restaurant creation of an ER diagram. Relationships between entities of ER diagram are the role/association of one entity to another, For eg. the relationship between hotel and rooms. Some of the relationships between the entities for the Hotel and Hospitality management sector would be as follows:
Hotel to Room (1:N):
- One hotel can have many rooms, but each room belongs to only one hotel.
- The relationship between the hotel and its rooms is a one-to-many relationship.
Guest to Reservation (1:N):
- A guest can make multiple reservations, but each reservation is made by only one guest.
- There is a one-to-many relationship between the guest and reservations.
Reservation to Room (1:1):
- A reservation is for one room, but each of the rooms can be reserved multiple times.
- This is a one-to-one relationship between reservation and room.
Staff to Department (N:1):
- Each staff member works in one department, but each department can have multiple staff members.
- For eg. housekeeping staff can also work with restaurant staff or vice versa
- There is a many-to-one relationship, as many staff members can belong to one department, but each staff member is associated with only one department.
Hotel and Department (1:N):
- Each hotel has multiple departments, such as Front Desk, Housekeeping, Food and Beverage, Maintenance, and Management.
- Each department operates within a specific hotel.
- This is a one-to-many relationship, as one hotel can have multiple departments, but each department belongs to only one hotel.
How to Design ER Diagrams for Hotel and Hospitality Management
Hotel and hospitality management enterprises provide various accommodation and leisure facilities to their guests and customers. They have a wide range of establishments including hotels, resorts, motels, inns, hostels, and other facilities.
This article will provide you with a comprehensive guide on designing ER diagrams for hotel and hospitality management by defining relationships and mapping cardinalities between its different internal modules.