WGU C170 - Data Management – Applications
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Domain
In data modeling, the construct used to organize
and describe an attribute's set of possible values.
Primary key (PK)
An identifier composed of one or more attributes
that uniquely identifies a row. Also, a candidate key
,selected as a unique entity identifier. A
minimal superkey.
Key
One or more attributes that determine other
attributes.
Determination
The role of a key. In the context of a database table,
the statement "A determines B" indicates that
knowing the value of attribute A means that the
value of attribute B can be looked up.
Determinant
Any attribute in a specific row whose value directly
determines other values in that row.
Dependent
An attribute whose value is determined by another
attribute.
Full functional dependence
,A condition in which an attribute is functionally
dependent on a composite key but not on any
subset of the key.
Composite key
A multiple-attribute key.
Key attributes
The attributes that form a primary key
Superkey
An attribute or attributes that uniquely identify
each entity in a table.
Candidate key
A minimal superkey; that is, a key that does not
contain a subset of attributes that is itself a
superkey.
Entity integrity
The property of a relational table that guarantees
each entity has a unique value in a primary key and
that the key has no null values.
Null
, The absence of an attribute value.
Foreign key
An attribute or attributes in one table whose values
must match the primary key in another table or
whose values must be null.
Referential integrity
A condition by which a dependent table's foreign
key must have either a null entry or a matching
entry in the related table.
Secondary key
A key used strictly for data retrieval purposes. For
example, the combination of last name, first name,
middle initial, and telephone number will probably
match the appropriate table row. Also called
an alternate key.
Relational algebra
A set of mathematical principles that form the basis
for manipulating relational table contents; the eight
main functions are SELECT, PROJECT, JOIN,
|Complete Exam Test |Recently Testing Real
Exam Questions | Verified Solutions (100%
correct)
Domain
In data modeling, the construct used to organize
and describe an attribute's set of possible values.
Primary key (PK)
An identifier composed of one or more attributes
that uniquely identifies a row. Also, a candidate key
,selected as a unique entity identifier. A
minimal superkey.
Key
One or more attributes that determine other
attributes.
Determination
The role of a key. In the context of a database table,
the statement "A determines B" indicates that
knowing the value of attribute A means that the
value of attribute B can be looked up.
Determinant
Any attribute in a specific row whose value directly
determines other values in that row.
Dependent
An attribute whose value is determined by another
attribute.
Full functional dependence
,A condition in which an attribute is functionally
dependent on a composite key but not on any
subset of the key.
Composite key
A multiple-attribute key.
Key attributes
The attributes that form a primary key
Superkey
An attribute or attributes that uniquely identify
each entity in a table.
Candidate key
A minimal superkey; that is, a key that does not
contain a subset of attributes that is itself a
superkey.
Entity integrity
The property of a relational table that guarantees
each entity has a unique value in a primary key and
that the key has no null values.
Null
, The absence of an attribute value.
Foreign key
An attribute or attributes in one table whose values
must match the primary key in another table or
whose values must be null.
Referential integrity
A condition by which a dependent table's foreign
key must have either a null entry or a matching
entry in the related table.
Secondary key
A key used strictly for data retrieval purposes. For
example, the combination of last name, first name,
middle initial, and telephone number will probably
match the appropriate table row. Also called
an alternate key.
Relational algebra
A set of mathematical principles that form the basis
for manipulating relational table contents; the eight
main functions are SELECT, PROJECT, JOIN,
