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Ch. 7 Dfd With Complete Solutions Latest Update
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Ch. 7 Dfd With Complete Solutions LatestUpdate
DFDs - correct answers 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 answers 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
answers
, Primary key: - correct answers a field in a table that uniquely identifies every
record in that table
Foreign key: - correct answers a primary key in one table that is included in
another table for linking purposes
Compound primary key: - correct answers 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 answers D) All of the above.
Pre-quiz:
Every _______ in a database table must be uniquely identified with a _________.
a.
field, primary key
b.
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