With your group, draw a context-level data flow diagram of your school’s or university’s registration system. Label each entity and process. Discuss why there appear to be different ways to draw the diagram. Reach consensus as a group about the best way to draw the diagram and defend your choice in a paragraph. Now, working with your group’s members, follow the appropriate steps for developing an E-R diagram and create one for your school or university registration system. Make sure your group indicates whether the relationship you depict is one-to-one, one-to-many, many-to-one, or many-to-many.
What will be an ideal response?
The context diagram should have external entities of Student, Registration, an entity that collects the student fee, and so on. The entity-relationship diagram should include Student, Class, and perhaps Course and Textbook entities.
There are many different ways to draw the diagram since the data flow names may vary and external entities may be placed anywhere around the diagram. External entities may also appear on both sides of the central process.
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‘Data warehouse and the underlying support for informational processing will emerge as a growing trend in the 1990s. With the advent of the data warehouse, some basic ideas about data management will change’ (Inmon, W.H., 1993). Briefly discuss why the emergence of the data warehouse phenomenon is causing such interest in the business world.
What will be an ideal response?
Answer the following statements true (T) or false (F)
1. A logical data flow diagram focuses on how the business operates. 2. A physical data flow diagram shows how the system will be implemented. 3. A transaction file links two processes that execute at different times. 4. Base elements are elements that need to be keyed into the system.