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Chapter 6 - Database

TermDefinition
one-to-many relationship An entity in entity set A is associated with any number (zero or more) of entities in entity set B. An entity in B, however, can be associated with at most one entity in A
Candidate Key A minimal superkey; that is, a key that does not contain a subset of attributes that is itself a superkey
recursive relationship set the same entity set participates in a relationship set more than once, in different roles
Binary relationship set a relationship between two different entities (degree of 2)
weak entity sets an entity set whose existence is dependent on another entity set (its identifying entity set)
strong entity sets an entity set whose existence is not dependent on the existence of other entity set
discriminator attributes attributes used to uniquely identify a weak entity
identifying relationship the relationship associating the weak entity set with the identifying entity set
specialization the process of designating subgrouping within an entity set
generalization a containment relationship that exists between a higher level entity set and one or more lower level entity sets
entity set set of entities of the same type that share the same properties or attributes
total participation Every member of an entity set must participate in at least one relationship
partial participation It is possible that some entities in an entity set do not participate in a relationship. Each entity instance need not be included at least once in the relationship set
superkey a set of one or more attributes that, taken collectively, allow us to uniquely identify a tuple in the relation
disjoint specialization When an entity must belong to at most one specialized entity set (single arrow)
overlapping specialization When an entity may belong to multiple specialized entity sets (two separate arrows)
Created by: nikkyham987
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