Data Modelling and Process Modelling. Using the Most Popular by Rosemary Rock-Evans

By Rosemary Rock-Evans

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How to do Data Modelling 57 4. Check each data item. Is it describing the class of thing you have given the name to? Ask 'of what', 'where* and 'when'. Could it describe anything else, any other hidden class of thing in the list of data items? If it can, remove these data items from the set they are in. Name the new set and create a one-to-one Relationship from the new set to the old. 5. Draw the Data Model separately and list the potential Attributes. Do not duplicate Entities if they appear more than once.

Course Name, Start Date and End Date, however all describe the course giving. No. of Students is slightly less obvious. It could be number of students on invoice or number of students on course giving. The latter seems more probable, but you would have to check this. The Company Name describes the company, the Account Number is that of the company, the Address is the company's. 22. 5. 23. Date Course Start Invoice Amount of Currency Date Charged No. Name Date Payable Invoice End Date No. of Company Account Address Students Name No.

Throughout the rest of this chapter and the book Itself, I will be using one example to demonstrate the methods. It is based on 'Course Administration', and is about the activities and data needed by a training Arm to organise and run its courses. I will also use just one convention - the SSADM/European - for simplicity's sake. You will be able to see how a Data Model, and subsequently the activity models, are built u p using this example. 19), which I will use to demonstrate the basic steps to follow when analysing forms and record layouts.

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