Specify whether each statement below is (i) always true, (ii) sometimes true, or (iii) never true. For those that are (ii) sometimes true, explain when the statement is true.
a. A context diagram does not include data stores.
b. A database table in 2NF is in 3NF as well.
c. A salesperson is an external entity in a data flow diagram.
d. Data flow diagrams are better than flowcharts for documenting accounting information systems.
e. Database forms can be used to look up information in a table.
f. Database queries store instructions, not data.
g. Database tables are needed for processes, external entities, and data stores in a DFD.
h. Database tables in 3NF are, by definition, also in 1NF and 2NF.
i. Decomposing a process numbered 2.0 would lead to numbers like 2.1, 2.2, and so on.
j. Lines in a data flow diagram should be labeled with verb phrases to show the movement of data.

  • CreatedAugust 06, 2015
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