WGU C170 - Data Management - Applications
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• associative entity -✓✓See composite entity.
• bridge entity -✓✓See composite entity.
• candidate key -✓✓A minimal superkey; that is, a key that does not contain a subset of
attributes that is itself a superkey. See key.
• closure -✓✓A property of relational operators that permits the use of relational algebra
operators on existing tables (relations) to produce new relations.
• composite entity -✓✓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 or associative entity. See also
linking table.
• composite key -✓✓A multiple-attribute key.
• dependent -✓✓An attribute whose value is determined by another attribute.
• 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.
• DIFFERENCE -✓✓In relational algebra, an operator used to yield all rows from one
table that are not found in another union-compatible table.
• DIVIDE -✓✓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.
• domain -✓✓In data modeling, the construct used to organize and describe an
attribute's set of possible values.
• 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.
• equijoin -✓✓A join operator that links tables based on an equality condition that
compares specified columns of the tables.
, • flags -✓✓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.
• foreign key (FK) -✓✓An attribute or attributes in one table whose values must match
the primary key in another table or whose values must be null. See key.
• full functional dependence -✓✓A condition in which an attribute is functionally
dependent on a composite key but not on any subset of the key.
• functional dependence -✓✓Within a relation R, an attribute B is functionally dependent
on an attribute A if and only if a given value of attribute A determines exactly one value
of attribute B. The relationship "B is dependent on A" is equivalent to "A determines B,"
and is written as A B.
• homonyms -✓✓The use of the same name to label different attributes. Homonyms
generally should be avoided. Some relational software automatically checks for
homonyms and either alerts the user to their existence or automatically makes the
appropriate adjustments. See also synonym.
• index -✓✓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 -✓✓See index.
• inner join -✓✓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.
• INTERSECT -✓✓In relational algebra, an operator used to yield only the rows that are
common to two union-compatible tables.
• JOIN -✓✓In relational algebra, a type of operator used to yield rows from two tables
based on criteria. There are many types of joins, such as natural join, theta join,
equijoin, and outer join.
• join columns -✓✓Columns that are used in the criteria of join operations. The join
columns generally share similar values (have a compatible domain).
• key -✓✓One or more attributes that determine other attributes. See also superkey,
candidate key, primary key (PK), secondary key, and foreign key.
• key attribute -✓✓The attributes that form a primary key. See also prime attribute.
(Latest 2026) Complete Questions and 100%
correct Answers Bundle (guaranteed pass)
• associative entity -✓✓See composite entity.
• bridge entity -✓✓See composite entity.
• candidate key -✓✓A minimal superkey; that is, a key that does not contain a subset of
attributes that is itself a superkey. See key.
• closure -✓✓A property of relational operators that permits the use of relational algebra
operators on existing tables (relations) to produce new relations.
• composite entity -✓✓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 or associative entity. See also
linking table.
• composite key -✓✓A multiple-attribute key.
• dependent -✓✓An attribute whose value is determined by another attribute.
• 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.
• DIFFERENCE -✓✓In relational algebra, an operator used to yield all rows from one
table that are not found in another union-compatible table.
• DIVIDE -✓✓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.
• domain -✓✓In data modeling, the construct used to organize and describe an
attribute's set of possible values.
• 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.
• equijoin -✓✓A join operator that links tables based on an equality condition that
compares specified columns of the tables.
, • flags -✓✓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.
• foreign key (FK) -✓✓An attribute or attributes in one table whose values must match
the primary key in another table or whose values must be null. See key.
• full functional dependence -✓✓A condition in which an attribute is functionally
dependent on a composite key but not on any subset of the key.
• functional dependence -✓✓Within a relation R, an attribute B is functionally dependent
on an attribute A if and only if a given value of attribute A determines exactly one value
of attribute B. The relationship "B is dependent on A" is equivalent to "A determines B,"
and is written as A B.
• homonyms -✓✓The use of the same name to label different attributes. Homonyms
generally should be avoided. Some relational software automatically checks for
homonyms and either alerts the user to their existence or automatically makes the
appropriate adjustments. See also synonym.
• index -✓✓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 -✓✓See index.
• inner join -✓✓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.
• INTERSECT -✓✓In relational algebra, an operator used to yield only the rows that are
common to two union-compatible tables.
• JOIN -✓✓In relational algebra, a type of operator used to yield rows from two tables
based on criteria. There are many types of joins, such as natural join, theta join,
equijoin, and outer join.
• join columns -✓✓Columns that are used in the criteria of join operations. The join
columns generally share similar values (have a compatible domain).
• key -✓✓One or more attributes that determine other attributes. See also superkey,
candidate key, primary key (PK), secondary key, and foreign key.
• key attribute -✓✓The attributes that form a primary key. See also prime attribute.
