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WGU C175/d426 Data Management Foundations Final exam study review solution basic key words ()
WGU C175/d426 Data Management Foundations Final exam study review solution basic key words ()
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WGU C175/d426 Data ManagementFoundations Final exam study review
solution basic key words (2022-2023)
What is a broad definition of data? - -Raw facts that are captured on printed
or digital media
-What are data? - -Facts that are collected and stored in a database system
-What is a determining characteristic of unstructured data? - -It does not
follow a data model.
-Which is true about flat files? - -They contain no internal hierarchical
organization.
-Which technology has no internal hierarchy? - -Flat files
-How were data retrieved before database management systems? - -
Sequentially from simple files
-In which two ways does a database management system environment
increase effectiveness in working with data? - -- It enables data sharing,
- It permits storage of vast volumes of data.
-What is the uniquely identifiable element about which data can be
categorized in an entity-relationship diagram? - -Entity types
-Which classification is correct for the box marked "Quantity" in the given
entity-relationship diagram? - -Intersection data
-Which data classification is an entity? - -Event
-A salesperson is authorized to sell 12 products; a product can be sold by 10
salespersons.
Which kind of binary relationship is described in this example? - -Many-to-
many
-Which three kinds of rules for referential integrity are provided by modern
relational database management systems? - -Insert, Delete, Update
-What is an important aspect of "referential integrity"? - -Reference to data
in one relation is based on values in another relation.
, -Sales data, detailing the customer names, products sold, and salespersons,
is kept in a database.
Which kind of data in this database would qualify as intersection data related
to both the product and salesperson entities? - -Customer names
-What is an attribute or group of attributes that uniquely identify a tuple in a
relation? - -Primary key
-What is necessary for a primary key in one relation of a database to match
with its corresponding foreign key in another relation of the same database?
- -A domain of values
-What uniquely identifies each entity in a collection of entities but is not the
primary key? - -The alternate key
-What is a term for a set of columns in a table that can uniquely identify any
record in that table without referring to other data? - -Candidate key
-What happens to the original data in database indexing? - -It is copied to
the index.
-Why are indexes created in a physical database design? - -To retrieve data
directly using a pointer.
-Why is an index created on a database column? - -To optimize data
retrievals
-Refer to the given SQL statement.
SELECT SPNUM, SPNAME
FROM SALESPERSON
What is the correct line to add to the end of this statement to find
salespersons with a commission percentage of 15? - -WHERE
COMMPERCT=15;
-Refer to the given SQL statement.
SELECT COMMPERCT, YEARHIRE
FROM SALESPERSON
WHERE SPNUM=22;
How should this statement be altered to retrieve the entire record instead of
the commission percentage and year of hire? - -Replace COMMPERCT,
YEARHIRE with an asterisk
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