Data Models Quiz

What is the main concept of the relational data model?

• Organizing data into tables with rows and columns

• Organizing data into key-value pairs

• Organizing data into graphs

• Storing data in a hierarchical structure

Which data model represents data as a collection of entities and their relationships?

• Hierarchical model

• Relational model

• Object-oriented model

• Entity-Relationship (ER) model

In which data model does data have a hierarchical structure with parent-child relationships?

• object-oriented data model

• relational data model

• network data model

• hierarchical data model

Which data model represents data as a collection of nodes connected by edges?

• array

• list

• tree

• graph

Which data model is based on the concept of objects and classes?

• Hierarchical Data Model

• Object-Oriented Data Model

• Network Data Model

• Relational Data Model

What is a primary key in the relational data model?

• A primary key is a field that can have duplicate values.

• A primary key is a foreign key that links two tables together.

• A primary key is a field that is not required in a table.

• A primary key is a unique identifier for each record in a table.

What is an entity in the entity-relationship model?

• An entity is a fictional character in a story.

• An entity is a real-world object or concept that has attributes and can be uniquely identified.

• An entity is a type of computer virus.

• An entity is a mathematical equation.

What is a root node in the hierarchical data model?

• The root node is the topmost node in the hierarchy.

• The root node is the bottommost node in the hierarchy.

• The root node is a node that has no children.

• The root node is a node that is located in the middle of the hierarchy.

What is a record in the network data model?

• A record is a collection of fields or attributes that represent a single entity or object in the network database.

• A record is a method for organizing data in the network database.

• A record is a type of data structure used in the network data model.

• A record is a collection of tables in the network database.

What is inheritance in the object-oriented data model?

• Inheritance is a mechanism in object-oriented programming where a class inherits the properties but not the behaviors of another class.

• Inheritance is a mechanism in object-oriented programming where a class inherits the behaviors but not the properties of another class.

• Inheritance is a mechanism in object-oriented programming where a class does not inherit the properties and behaviors of another class.

• Inheritance is a mechanism in object-oriented programming where a class inherits the properties and behaviors of another class.