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An entity in A is associated with at most one entity in B, and an entity in B is associated with at most one entity in A.This is called as
There are similarities between the instructor entity set and the secretary entity set in the sense that they have several attributes that are conceptually the same across the two entity sets: namely, the identifier, name, and salary attributes. This process is called
Which of the following refers to an entity in which the identifier of one entity includes the identifier of another entity?
In which of the following is a single-entity instance of one type of related to a single-entity instance of another type?
Which type of entity cannot exist in the database unless another type of entity also exists in the database, but does not require that the identifier of that other entity be included as part of its own identifier?
Which type of entity has its relationship to another entity determined by an attribute in that other entity called a discriminator?
In an Entity-Relationship (ER) model, suppose ? is a many-to-one relationship from entity set E1 to entity set E2. Assume that E1 and E2 participate totally in ? and that the cardinality of E1 is greater than the cardinality of E2. Which one of the following is true about ??
An ID-dependent entity is an entity whose identifier is a composite identifier where no portion of the composite identifier is an identifier of another entity.
A strong entity is an entity whose existence depends on some other entity type.
An entity in A is associated with at most one entity in B. An entity in B, however, can be associated with any number (zero or more) of entities in A.