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WGU C170 Chapter 1 2024 With Complete Solutions Latest Update
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WGU C170 Chapter 1 2024 With CompleteSolutions Latest Update
AREA - correct answers In DB2, a named section of permanent storage space that
is reserved to store the database.
associative entity - correct answers See composite entity.
bridge entity - correct answers See composite entity.
candidate key - correct answers A minimal superkey; that is, a key that does not
contain a subset of attributes that is itself a superkey. See key.
closure - correct answers A property of relational operators that permits the use
of relational algebra operators on existing tables (relations) to produce new
relations.
composite entity - correct answers 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 - correct answers A multiple-attribute key.
dependent - correct answers An attribute whose value is determined by another
attribute.
, determination - correct answers 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 - correct answers In relational algebra, an operator used to yield all
rows from one table that are not found in another union-compatible table.
DIVIDE - correct answers 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 - correct answers In data modeling, the construct used to organize and
describe an attribute's set of possible values.
entity integrity - correct answers 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 - correct answers A join operator that links tables based on an equality
condition that compares specified columns of the tables.
flags - correct answers 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.
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