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Terms in this set (37)
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.
What is true about flat files?
They contain no internal hierarchical organization.
Which technology has no internal hierarchy?
How were data retrieved before database management systems?
Sequentially from simple files.
What is the uniquely identifiable element about which data can be categorized in an entity-relationship diagram?
Which data classification is an entity?
A sales person is authorized to sell 12 products; a product can be sold by 10 salesperson. Which kind of binary relationship is described?
Many to many
Which three kinds of rules for referential integrity are provided by modern relational database management systems?
Delete Update Insert
What is an important aspect of referential integrity?
Reference to data in one relation is based on values in another relation.
Refer to the given SQL statement.
SELECT SPNUM, SPNAME
What is the correct line to add to the end of this statement to find salesperson with a commission percentage of 15?
Refer to the given SQL statement
SELECT COMMPERCT, YEARHIRE
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
A manager asks an employee to list attributes of the customers that are headquartered in Los Angeles and that have a customer number higher than 1000. Refer to the SQL statement
SELECT CUSTNUM, CUSTNAME, HQCITY
WHERE HQCITY='Los Angeles'
Which line should go at the end?
What is the difference between the DISTINCT and ORDER BY statements, in SQL SELECT commands?
ORDER BY modifies the presentation of data results and DISTINCT filters data results.
Which SQL statement aplhabetizes customer names within the same satellite office city?
ORDER BY SATCITY, CUSTNAME
The given SQL statement is intended to list the names of the products of which salesperson Fox has sold more tha n500 units.
FROM SALESPERSON, SALES, PRODUCT
which lines replace the ?
WHERE SALESPERSON.SPNUM=SALES.SPNUM AND SALES.PRODNUM=PRODUCT.PRODNUM
The given SQL statement is intended to query how many books there are with at least 800 pages from publishers in Los Angeles, United States
AND CITY='LOS ANGELES'
AND COUNTRY='UNITED STATES'
What replaces the ?
FROM PUBLISHER, BOOK
Which SQL statement will retrieve rows for all stores in Atlanta or Los Angeles or New York?
SELECT StoreID, City FROM Suppliers
WHERE City IN ('Atlanta', 'Los Angeles', 'New York')
Refer to the SQL statement
What would this accomplish?
List al lentries in the PRODUCT table
A product marketing company publishes an internet based newsletter about their new products to increase customer base. What is an advantage this company wil lgain from investing in a relational database management system that will store customer information?
Improved query response times
In which two ways does a database management system environment increase effectiveness in wotrking with data?
It permits storage of vast volumes of data
It enables data sharing
Sales data detailing the customer names, products sold, and salesperson is kept i na database
Which kind of data in this database would qualify as intersection data related to bnoth the product and salesperson entities?
What is an attribute or group of attributes that uniquely identify a tuple in a relation?
What is encessary 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 iun a table that can uniquely identify any record in that table without referring to other data>
What happens to the orifinal 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
What is a mehtodology for organizing attributes into tables?
What is the term for the value of one particular attribute associated with a specific single value of another attribute?
Which set of results should a company expect from implementing a business intel;ligence system?
increased proitability and increased throughput
Which issue is focused on the loading component of extract transform load (ETL)
Monitor refreshing volume and frequency
During which step in the Extract Transform Load process are raw data sets aggregated?
How is prediction distinguished from estimation in data mining?
Prediction classifies objects according to an expected future behavior
Where does affinity grouping occur in data mining?