Exam (elaborations)
INSY 3304 - Chapter 3 Terms
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INSY 3304 - Chapter 3 Terms...
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Entity - ANSWER is a person, place, event, or thing for which we intend tocollect data
Attribute - ANSWER describes a characteristic of an entity
Entity Set - ANSWER a group of entities of the same type
Table - ANSWER (relation) contains a group of related entities
Predicate Logic - ANSWER used extensively in mathematics to provide a
framework in which an assertion (statement of fact) can be verified as either
true or false
Set Theory - ANSWER a part of mathematical science that deals with sets, or
groups of things, and is used as the basis for data manipulation in the relational
model
Tuple - ANSWER in the relational model, a table row
Attribute Domain - ANSWER in data modelling, the construct used to organize
and describe an attribute's set of possible value
Atomic - ANSWER each row/column intersection represents a single data value
Cardinality - ANSWER the number of tuples in a table
Degree - ANSWER the number of columns
Primary Key (PK) - ANSWER an identifier composed of one or more attributes
that uniquely identifies a row
Key - ANSWER is a attribute that determines the values of other attributes
within an entity
Functional Dependence - ANSWER that the value of one or more attributes
determines the value of one or ore other attributes (A->B)
, Determinations - ANSWER is the state in which knowing the value of one
attribute make it possible to determine the value of another (B:A ->B)
Determinant - ANSWER (key) a attribute whose value is determines another
Dependent - ANSWER the attribute whose value is determined by the other
attribute
Full Functional Dependence - ANSWER is used to refer to functional
dependencies in which the entire collection of attributes in the determinant is
necessary for e relationship
Composite Key - ANSWER a multiple attribute key, key that composed of
more than one attribute
Key Attribute - ANSWER an attribute that is part of a key
Superkey - ANSWER is a key that can uniquely identify any row in the table
Candidate Key - ANSWER a key that does not contain a subset of attributes that
is itself a superkey
Entity Integrity - ANSWER guarantees that each entity is uniquely identified by
non-null primary key value
Null - ANSWER the absence of an attribute value. Note that null is not a blank
Foreign Key (FK) - ANSWER a attribute or attributes in one table whose value
must match the primary key in another tables or whose value must be null
Referential Integrity - ANSWER the condition in which every reference to an
entity instance by another entity instance is valid. A dependence table's foreign
key must have either a null entry or match entry in the related table.
Secondary Key - ANSWER as a key that is used strictly for data retrieval
purpose
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