a _ relationship exists when two entites are associated. course hero

What is a relationship between two entities?

A relationship is an association that exists between two entities. For example, Instructor teaches Class or Student attends Class. Most relationships can also be stated inversely.Feb 6, 2007

What is the relationship called when an association is maintained within a single entities?

associated with a relationship. • Unary relationship. – Association is maintained within single entity. • Binary relationship. – Two entities are associated.

Which relationship exists when three entities are associated?

A ternary relationship is an association among three entities. This type of relationship is required when binary relationships are not sufficient to accurately describe the semantics of the association. The ternary relationship construct is a single diamond connected to three entities as shown in Figure 2.3.

Is an association among two or more entities?

Explanation: A relationship is an association among several entities. A relationship specifies how two entities are related.

What is binary relationship in database?

A Binary Relationship is the relationship between two different Entities i.e. it is a relationship of role group of one entity with the role group of another entity. There are three types of cardinalities for Binary Relationships − 1.Jul 23, 2018

Is one in which a relationship can exist between occurrences of the same entity set?

A unary relationship, also called recursive, is one in which a relationship exists between occurrences of the same entity set. In this relationship, the primary and foreign keys are the same, but they represent two entities with different roles.

What is an entity in entity relationship model corresponds to a table?

An entity in the entity relationship model corresponds to a table in the relational environment. In the entity relationship model, a table row corresponds to an entity instance. In the Chen and Crow's Foot notations, an entity is represented with a rectangle containing the entity's name.

Can exist apart from all of its related entities and it is existence independent?

Strong Entities: If an entity can exist apart from all its related entities, then it is existence-independent and it is referred to as strong entity or regular entity. The concept of relationship strength is related on how primary keys (PK) are defined among entities.

When loading data into two entities with a 1'm relationship How should the data be loaded?

When loading data into two entities with a 1:M relationship, how should the data be loaded? The 1 side must be loaded first.

Which are the two ways in which entities can participate in a relationship?

Discussion ForumQue.Which are the two ways in which entities can participate in a relationship?b.Total and partialc.Simple and Complexd.All of the aboveAnswer:Total and partial1 more row

What is a relationship a one-to-many relationship?

In systems analysis, a one-to-many relationship is a type of cardinality that refers to the relationship between two entities (see also entity–relationship model) A and B in which an element of A may be linked to many elements of B, but a member of B is linked to only one element of A.

Which is used to represent an association between entity sets?

A relationship type represents the association between entity types. For example,'Enrolled in' is a relationship type that exists between entity type Student and Course. In ER diagram, relationship type is represented by a diamond and connecting the entities with lines.Sep 8, 2021