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What is a Data Flow Diagram?
Data Flow Diagram: A data flow diagram is the graph that shows flow of data values from their sources in objects in the course of processes which transform them to their destinations in other objects.
It does not show how values are controlled while computation. The Data Flow Diagram shows functional relationship of values computed by a system. DFD contains processes which transform data, data flows which move data, actor objects which produce and consume data and data store objects which store data passively.
What is an E-R model? Draw an E-R Diagram for the company database with following Descriptions? The company is organized within departments. Each department has a unique name a
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Write short notes on Schema diagram. A database schema along with primary key and foreign key dependencies can be depicted pictorially by schema diagram. Every relation appears
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Most computer systems authenticate users by asking them for the user name and password. However, the user names and passwords often can be guessed by hackers. Suggest an automated,
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