1
For Expert help and assignment solutions, +254707240657
WGU C170 Questions and Answers (100%
Correct Answers) Already Graded A+
Area —ANS: named section of permanent storage space that is
reserved to store the database
Associative Entity —ANS: Also known as composite entity
Bridge Entity —ANS: Another name for a composite entity
candidate key —ANS: A minimal superkey; that is, a key that does
© 2025 Assignment Expert
not contain a subset of attributes that is itself a superkey.
closure —ANS: A property of relational operators that permits the
use of relational algebra operators on existing tables (relations) to
Guru01 - Stuvia
produce new relations.
composite entity —ANS: An entity designed to transform an M:N
relationship into two 1:M relationships. The composite entity's
primary key comprises at least the primary keys of the entities that
it connects. Also known as a bridge entity. See also linking table.
composite key —ANS: A multiple attribute key
dependent —ANS: An attribute whose value is determined by
another attribute.
determination —ANS: 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.
DIFFERENCE —ANS: In relational algebra, an operator used to
yield all rows from one table that are not found in another union-
compatible table.
DIVIDE —ANS: In relational algebra, an operator that answers
queries about one set of data being associated with all values of
data in another set of data.
, 2
For Expert help and assignment solutions, +254707240657
domain —ANS: In data modeling, the construct used to organize
and describe an attributes set of possible values.
entity integrity —ANS: 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.
equijoin —ANS: A join operator that links tables based on an
equality condition that compares specified columns of the tables.
flags —ANS: Special codes implemented by designers to trigger a
required response, alert end users to specified conditions, or
encode values. Flags may be used to prevent nulls by bringing
attention to the absence of a value in a table.
© 2025 Assignment Expert
foreign key (FK) —ANS: An attribute or attributes in one table
whose values must match the primary key in another table or
whose values must be null.
Guru01 - Stuvia
full functional dependence —ANS: A condition in which an
attribute is functionally dependent on a composite key but not on
any subset of the key.
functional dependence —ANS: Within a relation R, an attribute B
is functionally dependent on an attribute A if and only if a given
value of the attribute A determines exactly one value of the
attribute B. The relationship "B is dependent on A" is equivalent to
"A determines B" and is written as A B.
homonyms —ANS: The use of the same name to label different
attributes. Homonyms should be avoided in databases
index —ANS: An ordered array of index key values and row ID
values (pointers). Indexes are generally used to speed up and
facilitate data retrieval. Also known as an index key.
index key —ANS: Also called an index.
inner join —ANS: A join operation in which only rows that meet a
given criterion are selected. The join criterion can be an equality
condition (natural join or equijoin) or an inequality condition (theta
join). The inner join is the most commonly used type of join.
Contrast with outer join.
For Expert help and assignment solutions, +254707240657
WGU C170 Questions and Answers (100%
Correct Answers) Already Graded A+
Area —ANS: named section of permanent storage space that is
reserved to store the database
Associative Entity —ANS: Also known as composite entity
Bridge Entity —ANS: Another name for a composite entity
candidate key —ANS: A minimal superkey; that is, a key that does
© 2025 Assignment Expert
not contain a subset of attributes that is itself a superkey.
closure —ANS: A property of relational operators that permits the
use of relational algebra operators on existing tables (relations) to
Guru01 - Stuvia
produce new relations.
composite entity —ANS: An entity designed to transform an M:N
relationship into two 1:M relationships. The composite entity's
primary key comprises at least the primary keys of the entities that
it connects. Also known as a bridge entity. See also linking table.
composite key —ANS: A multiple attribute key
dependent —ANS: An attribute whose value is determined by
another attribute.
determination —ANS: 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.
DIFFERENCE —ANS: In relational algebra, an operator used to
yield all rows from one table that are not found in another union-
compatible table.
DIVIDE —ANS: In relational algebra, an operator that answers
queries about one set of data being associated with all values of
data in another set of data.
, 2
For Expert help and assignment solutions, +254707240657
domain —ANS: In data modeling, the construct used to organize
and describe an attributes set of possible values.
entity integrity —ANS: 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.
equijoin —ANS: A join operator that links tables based on an
equality condition that compares specified columns of the tables.
flags —ANS: Special codes implemented by designers to trigger a
required response, alert end users to specified conditions, or
encode values. Flags may be used to prevent nulls by bringing
attention to the absence of a value in a table.
© 2025 Assignment Expert
foreign key (FK) —ANS: An attribute or attributes in one table
whose values must match the primary key in another table or
whose values must be null.
Guru01 - Stuvia
full functional dependence —ANS: A condition in which an
attribute is functionally dependent on a composite key but not on
any subset of the key.
functional dependence —ANS: Within a relation R, an attribute B
is functionally dependent on an attribute A if and only if a given
value of the attribute A determines exactly one value of the
attribute B. The relationship "B is dependent on A" is equivalent to
"A determines B" and is written as A B.
homonyms —ANS: The use of the same name to label different
attributes. Homonyms should be avoided in databases
index —ANS: An ordered array of index key values and row ID
values (pointers). Indexes are generally used to speed up and
facilitate data retrieval. Also known as an index key.
index key —ANS: Also called an index.
inner join —ANS: A join operation in which only rows that meet a
given criterion are selected. The join criterion can be an equality
condition (natural join or equijoin) or an inequality condition (theta
join). The inner join is the most commonly used type of join.
Contrast with outer join.
