Data Modeling with ER Model - Database MCQ Questions and answers- Technical Aptitude

The statement is False.
A ternary relationship involves three entities participating in a relationship.
It's not limited to two entities and one association.
The 'ternary' prefix indicates the involvement of three components, in this case, three entities.

In the context of data modeling with the Entity-Relationship (ER) model, minimum cardinality refers to the minimum number of entity instances that must participate in a relationship instance. It defines the minimum requirement for participation in a relationship.

For example, in a "Customer" and "Order" relationship where a customer may place zero or more orders, the minimum cardinality on the "Order" side would be zero, indicating that a customer can exist without placing any orders.

Conversely, if there was a requirement that every customer must place at least one order, the minimum cardinality on the "Order" side would be one, indicating that every customer must have at least one associated order.

Therefore, the statement that Option A: True is correct because the minimum cardinality indeed represents the minimum number of entity instances that may participate in a relationship instance.

The answer is A: True.
Here's why:
Think of building a house:
1. First, you decide what rooms you need (entities) - like kitchen, bedroom, bathroom.
2. Then, you decide what each room will have (attributes) - like kitchen has a sink, stove, refrigerator. Bedroom has a bed, wardrobe.
3. Finally, you decide how the rooms connect (relationships) - like the kitchen is next to the dining room, the bedroom is upstairs.
Similarly, in database design:
* Entities are like the main objects you want to store information about (e.g., Customer, Product, Order).
* Attributes are the properties of those objects (e.g., Customer has Name, Address, Phone Number).
* Relationships show how these objects relate to each other (e.g., a Customer places an Order).
So, identifying entities, then attributes, then relationships is a fundamental and correct approach in database design using ER models.