WorksheetsData Models Quiz
Total questions: 10
Worksheet time: 5mins
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.
