WGU C170 Data Management – Applications
domain Answer- In data modeling, the construct used to organize and describe an attribute's set of
possible values
superkey Answer- An attribute or attributes that uniquely iden
...
WGU C170 Data Management – Applications
domain Answer- In data modeling, the construct used to organize and describe an attribute's set of
possible values
superkey Answer- An attribute or attributes that uniquely identify each entity in a table. Any composite
key with this is also this.
candidate key Answer- A minimal superkey; that is, a key that does not contain a subset of attributes
that is itself a superkey
entity integrity Answer- 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
referential integrity Answer- A condition by which a dependent table's foreign key must have either a
null entry or a matching entry in the related table
data dictionary Answer- A DBMS component that stores metadata. It contains the data definition & their
characteristics and relationships; may also include data external to the DBMS
system catalog Answer- A detailed system data dictionary that describes all objects in a database
homonym Answer- The use of the same name to label different attributes, much like similar-sounding
words with different meanings
synonym Answer- The use of different names to identify the same object, such as an entity, an attribute,
or a relationship. These should generally be avoided.
not null and unique Answer- Any candidate key must have these two constraints enforced
cardinality Answer- Term for how many instances of one object are related to instances of another
object (maximum)modality Answer- Term for whether an instance of a specific entity is optional or mandatory in a
relationship (minimum)
connectivity Answer- Term for the classification of the relationship between entities. Classifications
include 1:1, 1:M, and M:N
CREATE SCHEMA AUTHORIZATION Answer- SQL command to create a database schema
DEFAULT Answer- SQL option to define a default value for a column (when no value is given)
CHECK Answer- SQL command to validate data in an attribute, used during table column creation
CREATE TABLE AS Answer- SQL command to create a new table based on a query in the user's database
schema
HAVING Answer- SQL option that restricts a selection of grouped rows based on a condition
EXISTS Answer- SQL option that checks whether a subquery returns any rows
DECIMAL Answer- SQL data type like the NUMBER specification, but the storage length is a minimum
specification
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