project university student cafe.
1. Identify the entities and their attributes
2. Identify the degree of their relationship
3. Identify their cardinalities
Constraints
1. Entities and their attributes:
- University (entity): Name, Location, Number of Students
- Student (entity): Name, ID, Major, Grade, Email
- Cafe (entity): Name, Location, Opening Hours, Menu
- Order (entity): Order ID, Student ID, Cafe Name, Order Date
- Menu Item (entity): Item ID, Item Name, Item Price
- Staff (entity): Staff ID, Name, Position, Email
2. Degree of their relationship:
- University has a relationship with Student (1 to many: a university can have multiple students)
- Student has a relationship with University (many to 1: a student can attend only one university)
- Student has a relationship with Order (1 to many: a student can place multiple orders)
- Order has a relationship with Student (many to 1: an order is placed by only one student)
- Order has a relationship with Cafe (many to 1: an order is placed at only one cafe)
- Cafe has a relationship with Order (1 to many: a cafe can have multiple orders)
- Cafe has a relationship with Menu Item (1 to many: a cafe can have multiple menu items)
- Menu Item has a relationship with Cafe (many to 1: a menu item belongs to only one cafe)
- Staff has a relationship with Cafe (1 to many: a staff member can work at multiple cafes)
- Cafe has a relationship with Staff (many to 1: a cafe can have multiple staff members)
3. Cardinalities:
- University entity cardinality: 1
- Student entity cardinality: Many
- Cafe entity cardinality: Many
- Order entity cardinality: Many
- Menu Item entity cardinality: Many
- Staff entity cardinality: Many
1. Entities and their attributes for the university student cafe project could include:
- Student: Attributes could include student ID, name, email, major, and year of study.
- Cafe: Attributes could include cafe ID, name, location, and opening hours.
- Menu Item: Attributes could include item ID, name, description, price, and allergen information.
- Order: Attributes could include order ID, student ID (foreign key), cafe ID (foreign key), date and time of order.
2. The degree of their relationship would involve:
- Student to Cafe: Many-to-one relationship, as multiple students can visit the same cafe.
- Cafe to Menu Item: Many-to-many relationship, as a cafe can offer multiple menu items and a menu item can be available at multiple cafes.
- Student to Order: One-to-many relationship, as a student can place multiple orders but an order is associated with only one student.
- Cafe to Order: One-to-many relationship, as a cafe can receive multiple orders but an order is associated with only one cafe.
3. The cardinalities for the relationships would be:
- Student to Cafe: One student can be associated with only one cafe, but a cafe can have multiple students.
- Cafe to Menu Item: A menu item can be available at multiple cafes, and a cafe can offer multiple menu items.
- Student to Order: A student can place multiple orders, but an order is associated with only one student.
- Cafe to Order: A cafe can receive multiple orders, but an order is associated with only one cafe.
Constraints for the project can include:
- Each student can place multiple orders at different cafes.
- A cafe can have a limited number of menu items available.
- Some menu items may have specific requirements or availability restrictions.
- Orders should include date and time stamps for tracking purposes.
- Only registered students can access the cafe and place orders.
To identify the entities, attributes, degree of relationship, and cardinalities for a project of a university student cafe, we need to consider the following:
1. Entities and their attributes:
Entities are the main objects or concepts involved in the project. In this case, some possible entities could be:
- Student: Attributes may include student ID, name, major, year of enrollment, and contact information.
- Cafe: Attributes may include cafe ID, name, location, opening hours, and contact information.
- Menu: Attributes may include menu item ID, name, description, price, and availability.
- Order: Attributes may include order ID, student ID, cafe ID, date, time, and total amount.
2. Degree of their relationships:
The degree of relationship refers to the number of entities involved in a relationship. For example:
- Student and Cafe may have a relationship of "frequent," as students can visit and patronize the cafe.
- Student and Order may have a relationship of "places," as students can place orders for food or drinks at the cafe.
- Cafe and Menu may have a relationship of "offers," as the cafe provides the menu items.
3. Cardinalities:
Cardinality refers to the number of instances or occurrences of one entity associated with another entity in a relationship. It helps define the minimum and maximum number of occurrences in a relationship. Some possible cardinalities for the relationships mentioned above could be:
- One student can frequent multiple cafes, but one cafe can be frequented by multiple students (many-to-many relationship).
- One student can place multiple orders, but one order can be placed by only one student (one-to-many relationship).
- One cafe can offer multiple menu items, but one menu item can be offered by only one cafe (one-to-many relationship).
Constraints are additional rules or conditions to consider. Depending on the specific requirements of the project, some constraints could be:
- A student can only place an order if they have a valid student ID.
- A cafe may have limited operating hours.
- A menu item may have specific dietary restrictions or allergen information.
These are general considerations, and the actual entities, attributes, relationships, and constraints may vary based on the specific requirements and scope of the project.