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WGU C175 Final+1+2 Questions and Answers.
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WGU C175 Final+1+2 Questions and Answers.
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WGU C175 Final+1+2 Questions and AnswersWhat is a broad definition of data? - (correct answer) -Raw facts that are captured on printed or digital
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media
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What are data? - (correct answer) -Facts that are collected and stored in a database system
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What is a determining characteristic of unstructured data? - (correct answer) -It does not follow a data
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model.
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Which is true about flat files? - (correct answer) -They contain no internal hierarchical organization.
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Which technology has no internal hierarchy? - (correct answer) -Flat files
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How were data retrieved before database management systems? - (correct answer) -Sequentially from
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simple files
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In which two ways does a database management system environment increase effectiveness in working
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with data? - (correct answer) -- It enables data sharing,
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- It permits storage of vast volumes of data.
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What is the uniquely identifiable element about which data can be categorized in an entity-relationship
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diagram? - (correct answer) -Entity types
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Which classification is correct for the box marked "Quantity" in the given entity-relationship diagram? -
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(correct answer) -Intersection data
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Which data classification is an entity? - (correct answer) -Event
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A salesperson is authorized to sell 12 products; a product can be sold by 10 salespersons.
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Which kind of binary relationship is described in this example? - (correct answer) -Many-to-many
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Which three kinds of rules for referential integrity are provided by modern relational database
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management systems? - (correct answer) -Insert, Delete, Update
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, What is an important aspect of "referential integrity"? - (correct answer) -Reference to data in one
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relation is based on values in another relation.
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Sales data, detailing the customer names, products sold, and salespersons, is kept in a database.
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Which kind of data in this database would qualify as intersection data related to both the product and
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salesperson entities? - (correct answer) -Customer names
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What is an attribute or group of attributes that uniquely identify a tuple in a relation? - (correct answer)
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-Primary key
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What is necessary for a primary key in one relation of a database to match with its corresponding
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foreign key in another relation of the same database? - (correct answer) -A domain of values
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What uniquely identifies each entity in a collection of entities but is not the primary key? - (correct
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answer) -The alternate key
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What is a term for a set of columns in a table that can uniquely identify any record in that table without
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referring to other data? - (correct answer) -Candidate key
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What happens to the original data in database indexing? - (correct answer) -It is copied to the index.
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Why are indexes created in a physical database design? - (correct answer) -To retrieve data directly
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using a pointer.
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Why is an index created on a database column? - (correct answer) -To optimize data retrievals
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Refer to the given SQL statement.
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SELECT SPNUM, SPNAME yi yi yi
FROM SALESPERSON yi yi
What is the correct line to add to the end of this statement to find salespersons with a commission
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percentage of 15? - (correct answer) -WHERE COMMPERCT=15;
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Refer to the given SQL statement.
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SELECT COMMPERCT, YEARHIREyi yi yi
FROM SALESPERSON yi yi
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