Home > Information Technology > Database > Entity-Relationship Diagrams (ERDs)
25 QuestionsLog inwatch on youtube 
00:00:00

ЁЯОБ Claim Rewards

ЁЯОБ Login to earn rewards !!!


25 uniquely designed questions just for you to evaluate your skills in Entity-Relationship Diagrams (ERDs) quiz. Are you ready to challenge yourself and explore more? Let's get started and see how much you can score out of 25.

Test your knowledge of Entity-Relationship Diagrams (ERDs) with these 25 multiple-choice questions. Explore concepts such as entities, attributes, relationships, cardinality, and modeling techniques in this comprehensive quiz

Please feel free to report any corrections if you come across any inaccuracies or errors. Your feedback is valuable in maintaining the accuracy of our content.

Questions

1. What is an Entity-Relationship Diagram (ERD) used for?
Answer: To represent the structure of a database
Explanation: An ERD is used to represent the structure of a database, including entities, their attributes, and the relationships between entities.Report for correction
2. In an ERD, what does an "entity" represent?
Answer: A physical object in the real world
Explanation: In an ERD, an "entity" represents a physical object or concept in the real world that is relevant to the database.Report for correction
3. What is the purpose of an "attribute" in an ERD?
Answer: To describe a property or characteristic of an entity
Explanation: In an ERD, an "attribute" is used to describe a property or characteristic of an entity, providing details about the entity.Report for correction
4. In an ERD, what is a "relationship" between entities?
Answer: A connection or association between entities
Explanation: In an ERD, a "relationship" represents a connection or association between entities, indicating how they are related to each other.Report for correction
5. Which notation is commonly used to represent entities in an ERD?
Answer: Rectangles
Explanation: Rectangles are commonly used to represent entities in an ERD, with the entity name written inside the rectangle.Report for correction
6. In an ERD, what notation is typically used to represent attributes?
Answer: Rectangles
Explanation: Rectangles are typically used to represent attributes in an ERD, with the attribute name written inside the rectangle.Report for correction
7. In an ERD, how is a one-to-many (1:N) relationship represented?
Answer: With a dashed line connecting entities
Explanation: A one-to-many (1:N) relationship in an ERD is typically represented with a dashed line connecting the related entities.Report for correction
8. What does a diamond shape represent in an ERD?
Answer: A relationship
Explanation: In an ERD, a diamond shape represents a relationship between entities, indicating how they are related to each other.Report for correction
9. In an ERD, what does a double line connecting entities indicate?
Answer: A weak relationship
Explanation: A double line connecting entities in an ERD indicates a weak relationship between them, meaning that the relationship is optional or may not exist for all entities.Report for correction
10. What is a "cardinality" in the context of ERD relationships?
Answer: The number of instances of an entity
Explanation: In the context of ERD relationships, "cardinality" refers to the number of instances of an entity that can be related to another entity.Report for correction
11. In an ERD, what does "crows feet" notation represent?
Answer: Many instances on one side of the relationship
Explanation: "Crows feet" notation in an ERD represents many instances on one side of the relationship, indicating a one-to-many relationship.Report for correction
12. What is a "composite key" in an ERD?
Answer: A key made of multiple attributes
Explanation: A composite key in an ERD is a key made of multiple attributes, used to uniquely identify entities when a single attribute is insufficient.Report for correction
13. In an ERD, what does "total participation" mean in a relationship?
Answer: All entities must participate in the relationship
Explanation: "Total participation" in an ERD means that all entities involved in the relationship must participate, and none can be optional.Report for correction
14. What does "partial participation" mean in the context of ERD relationships?
Answer: Some entities may participate in the relationship
Explanation: "Partial participation" in ERD relationships means that some entities involved in the relationship may choose not to participate, making their involvement optional.Report for correction
15. In an ERD, what is the purpose of a "derived attribute"?
Answer: To represent an attribute that is derived from other attributes
Explanation: A "derived attribute" in an ERD represents an attribute that is derived or calculated from other attributes in the database.Report for correction
16. What is a "recursive relationship" in an ERD?
Answer: A relationship between an entity and itself
Explanation: A "recursive relationship" in an ERD is a relationship between an entity and itself, often used to represent hierarchical or self-referencing relationships.Report for correction
17. In an ERD, what is the purpose of a "weak entity"?
Answer: To represent an entity that cannot be uniquely identified by its attributes alone
Explanation: A "weak entity" in an ERD represents an entity that cannot be uniquely identified by its attributes alone and depends on a related strong entity.Report for correction
18. What does "multiplicity" refer to in an ERD relationship?
Answer: The number of relationships between entities
Explanation: "Multiplicity" in an ERD relationship refers to the number of relationships between entities, indicating how many instances of one entity can be related to another.Report for correction
19. In an ERD, what is the purpose of a "superclass" or "parent entity"?
Answer: To represent an entity that inherits attributes and relationships
Explanation: A "superclass" or "parent entity" in an ERD represents an entity that inherits attributes and relationships to be shared with its subclasses or child entities.Report for correction
20. In an ERD, what does "inheritance" represent?
Answer: The process of deriving attributes and relationships from a superclass
Explanation: "Inheritance" in an ERD represents the process of deriving attributes and relationships from a superclass to its subclasses.Report for correction
21. In an ERD, what does "aggregation" represent?
Answer: The process of combining entities into a higher-level entity
Explanation: "Aggregation" in an ERD represents the process of combining entities into a higher-level entity to simplify modeling.Report for correction
22. What is the primary goal of normalizing an ERD?
Answer: To improve data integrity
Explanation: The primary goal of normalizing an ERD is to improve data integrity by minimizing data redundancy and organizing data efficiently.Report for correction
23. In an ERD, what is the purpose of a "constraining relationship"?
Answer: To enforce data constraints
Explanation: A "constraining relationship" in an ERD is used to enforce data constraints, ensuring that certain conditions are met.Report for correction
24. In an ERD, what does "role name" refer to?
Answer: A label or alias assigned to a role in a relationship
Explanation: In an ERD, a "role name" refers to a label or alias assigned to a role in a relationship, helping to clarify the meaning of the role.Report for correction
25. What is the purpose of a "multi-valued attribute" in an ERD?
Answer: To represent an attribute with multiple values
Explanation: A "multi-valued attribute" in an ERD is used to represent an attribute that can have multiple values for a single entity.Report for correction






"Hardships often prepare ordinary people for an extraordinary destiny."