1 WGU C175 Final Exam/ Actual Exam Questions with Correct Verified Answers/ Rated A+
What are data? - ANS - Facts that are collected and stored in a database system
What is a determining characteristic of unstructured data? - ANS - It does not follow a data model.
Which three kinds of rules for referential integrity are provided by modern relational database management systems? - ANS - Insert, Delete, Update
What is an important aspect of "referential integrity"? - ANS - Reference to data in one relation is based on values in another relation.
Which kind of data in this database would qualify as intersection data related to both the product and salesperson entities? - ANS - Customer names
What is a broad definition of data? - ANS - Raw facts that are captured on printed or digital media
What is an attribute or group of attributes that uniquely identify a tuple in a relation? - ANS - 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? - ANS - A domain of values
What uniquely identifies each entity in a collection of entities but is not the primary key? - ANS - 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? - ANS - Candidate key 1 / 2
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What happens to the original data in database indexing? - ANS - It is copied to the index.
Why are indexes created in a physical database design? - ANS - To retrieve data directly using a pointer.
Why is an index created on a database column? - ANS - To optimize data retrievals
Which is true about flat files? - ANS - They contain no internal hierarchical organization.
Which technology has no internal hierarchy? - ANS - Flat files
How were data retrieved before database management systems? - ANS - Sequentially from simple files
In which two ways does a database management system environment increase effectiveness in working with data? - ANS - - 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? - ANS - Entity types
Which classification is correct for the box marked "Quantity" in the given entity-relationship diagram? - ANS - Intersection data
Which data classification is an entity? - ANS – Event
What would this SQL statement accomplish? - ANS - List all entries in the PRODUCT table.
What is a methodology for organizing attributes into tables? - ANS - Data normalization
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