DFDs - Correct Answer Two main purposes:
Understanding a business process
Understanding the relational database that underlies the AIS
Focus on data
A circle in a data flow diagram represents:
A) A data flow
B) An external entity
C) A database
D) A business process
E) A repeat loop -...
Ch. 7 DFD || ANSWERED AND GRADED
DFDs - Correct Answer Two main purposes:
Understanding a business process
Understanding the relational database that underlies the AIS
Focus on data
A circle in a data flow diagram represents:
A) A data flow
B) An external entity
C) A database
D) A business process
E) A repeat loop - Correct Answer D) A business process
Which of the following statements about systems flowcharts and data flow diagrams is
most true?
A) Processes are numbered in a flowchart, but not a data flow diagrams.
B) Processes are numbered in a data flow diagrams, but not a flowchart
C) Processes are numbered in both flowcharts and data flow diagrams.
D) Processes are numbered in neither flowcharts nor data flow diagrams. - Correct
Answer
Primary key: - Correct Answer a field in a table that uniquely identifies every record in
that table
Foreign key: - Correct Answer a primary key in one table that is included in another
table for linking purposes
Compound primary key: - Correct Answer two or more fields in a table that together
comprise its primary key
Booksellers of Buffalo is a small, independent bookstore that both publishes and sells
very specialized titles. They currently have about 50 clients; they publish and sell 30
different books at present. The company's management has asked you to create
database tables to support their operations. Any database tables that are in third normal
form should:
A) Eliminate repeating groups.
B) Eliminate redundant data.
C) Eliminate columns not dependent on the primary key.
D) All of the above. - Correct Answer D) All of the above.
Pre-quiz:
Every _______ in a database table must be uniquely identified with a _________.
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