0
A relationship between the instances of a single entity type is called a ........................?
Wiki User
∙ 12y ago
it is a unary relationship.
Wiki User
∙ 12y ago
Add your answer:
Earn +20 pts
Explain entity relationship model with suitable example?
An entity relationship model is a visual representation of the relationships between entities in a database. For example, in a university database, you could have entities such as "Student," "Course," and "Instructor," with relationships like "Student enrolls in Course" and "Instructor teaches Course." These relationships are represented by lines connecting the entities in a diagram, showing how they are connected and interact with each other.
Is the 4-h headquarters a private entity?
The 4-H headquarters is operated by the National Institute of Food and Agriculture (NIFA), which is a federal agency within the United States Department of Agriculture (USDA). While it is government-funded and affiliated with a federal agency, it is not a private entity.
A is a series of direct and indirect ties from one actor to a collection of others.?
Netwrok
What is the relation between a state and a nation?
A state is a political entity with defined borders and a government, while a nation is a group of people who share a common identity, culture, and history. A state can encompass one or more nations, and a nation can exist across multiple states. The terms are often used interchangeably, but they refer to different concepts.
What is an antonym of separate?
The antonym of separate is "unite" or "join." It refers to bringing things together or combining them into a single entity.
What is cardinality ratio in ER diagram?
It specify the number of relationship instances that an entity can participate in.
What does the cardinality ratio specify?
The cardinality ratio specifies the number of relationship instances that an entity can participate in.
When do you have to use an intersection entity in database?
An intersection entity is used in a database when there is a many-to-many relationship between two entities. It serves as a bridge table to resolve the many-to-many relationship by breaking it into two one-to-many relationships. Each record in the intersection entity represents a combination of records from the two related entities.
What are the advantages and disadvantages of Entity Relationship Diagrams?
Entity-Relationship diagrams are useful for modelling data and the relationships between the data. They can be used when the constraints between data are relatively simple. They do not allow specification of interactions between the data or model how the data changes (there are no processes in Entity-Relationship). Entity-Relationship diagrams are most often used to model databases.
What is Entity instances?
Entity instance is a single occurrence of an entity type. Also known as an instance. Unlike entity type, many instances of entity type may be represented by data stored in the database.
Entity Relationship diagram for Hotel Reservation System?
An entity relationship diagram for hotel reservation systems is a map of each entity or thing that has a part in the process of hotel reservations. The diagram maps the relationship between each entity of the process.
What is total participation in database management?
Participation (or optionality) concerns the involvement of entities i a relationship. Participation is about exceptions to the rule. An entity's participation is optional if there is a least one instance of an entity which does not participate in the relationship. An entity participation is mandatory if all instances of an entity must participate in the relationship.
What is the Enhanced Entity Relationship Model?
is called specialization and generalization.
What is relationship in database management system?
A relationship is an association between the instances of one or more entity types. For example, a student may be related to a class by being enrolled in that class. Another example is the link between mother and children. One mother may have many children, but each child has only one mother.A relationship between entities is given a relevant name. For example, there is a relationship between MANAGER and DEPARTMENT. A manager manages the department; on the other hand a department is managed by a manager. This leads to a relationship called "Manages" between MANAGER and DEPARTMENT.Similarly, there is a relationship between AUTHOR and the BOOK. An author writes a book; on the other hand a Book is written by an Author. This leads to a relationship called "Writes" between AUTHOR and BOOK
What is the difference between associative entity and relationship with attribute?
An associative entity is used to represent a many-to-many relationship between two or more entities in a database, while a relationship with attribute represents additional information or properties about the relationship itself. In other words, an associative entity helps in resolving many-to-many relationships, while a relationship with attribute adds details about the connections between entities.
What is the difference between Cardinality and Degree?
Degree the number of entity types that participate in a relationship.
Entity relationship diagram for online banking?
An entity-relationship diagram for online banking includes the process of online banking and the relationship between each step. It is a model that maps out, describes, and defines how components are linked for online banking.
