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State about the Activity Diagram
Activity diagrams show flow from one activity to other. It is an ongoing non atomic execution within a state machine. Activity finally results in some action that is made up of executable atomic computations which result in a change in state of system, or return of a value. It consists of activity states, action states, objects and transition states. The activity diagram for encryption of a message send via e-mail is shown as:
Figure: Activity diagram for E-mail encryption
In case of entity integrity, the primary key may be declared? In a case of entity integrity primary key may be not Null.
normal forms
Using the questions found at the end of Chapter 9 in your textbook, complete this homework activity. Students will submit a Word document answering questions 2, 3, and 4.
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