1. What is a "composite key" in an ERD?
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 correction2. In an ERD, what does an "entity" represent?
Explanation: In an ERD, an "entity" represents a physical object or concept in the real world that is relevant to the database.
Report for correction3. What is a "recursive relationship" in an ERD?
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 correction4. In an ERD, what is a "relationship" 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 correction5. In an ERD, what does a double line connecting entities indicate?
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 correction6. In an ERD, what does "crows feet" notation represent?
Explanation: "Crows feet" notation in an ERD represents many instances on one side of the relationship, indicating a one-to-many relationship.
Report for correction7. In an ERD, what does "total participation" mean in a relationship?
Explanation: "Total participation" in an ERD means that all entities involved in the relationship must participate, and none can be optional.
Report for correction8. What does "partial participation" mean in the context of ERD relationships?
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 correction9. What does a diamond shape represent in an ERD?
Explanation: In an ERD, a diamond shape represents a relationship between entities, indicating how they are related to each other.
Report for correction10. In an ERD, what notation is typically used to represent attributes?
Explanation: Rectangles are typically used to represent attributes in an ERD, with the attribute name written inside the rectangle.
Report for correction11. Which notation is commonly used to represent entities in an ERD?
Explanation: Rectangles are commonly used to represent entities in an ERD, with the entity name written inside the rectangle.
Report for correction12. In an ERD, what does "role name" refer to?
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 correction13. What is a "cardinality" in the context of ERD relationships?
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 correction14. What does "multiplicity" refer to in an ERD relationship?
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 correction15. In an ERD, what does "inheritance" represent?
Explanation: "Inheritance" in an ERD represents the process of deriving attributes and relationships from a superclass to its subclasses.
Report for correction16. In an ERD, what does "aggregation" represent?
Explanation: "Aggregation" in an ERD represents the process of combining entities into a higher-level entity to simplify modeling.
Report for correction17. What is an Entity-Relationship Diagram (ERD) used for?
Explanation: An ERD is used to represent the structure of a database, including entities, their attributes, and the relationships between entities.
Report for correction18. In an ERD, what is the purpose of a "constraining relationship"?
Explanation: A "constraining relationship" in an ERD is used to enforce data constraints, ensuring that certain conditions are met.
Report for correction19. What is the primary goal of normalizing an ERD?
Explanation: The primary goal of normalizing an ERD is to improve data integrity by minimizing data redundancy and organizing data efficiently.
Report for correction20. What is the purpose of a "multi-valued attribute" in an ERD?
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 correction21. What is the purpose of an "attribute" in an ERD?
Explanation: In an ERD, an "attribute" is used to describe a property or characteristic of an entity, providing details about the entity.
Report for correction22. In an ERD, what is the purpose of a "weak entity"?
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 correction23. In an ERD, what is the purpose of a "superclass" or "parent entity"?
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 correction24. In an ERD, what is the purpose of a "derived attribute"?
Explanation: A "derived attribute" in an ERD represents an attribute that is derived or calculated from other attributes in the database.
Report for correction25. In an ERD, how is a one-to-many (1:N) relationship represented?
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