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

By Rosemary Rock-Evans

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Of Sessions Public/ In-house Start Date End Date Lecturers Hotel/ Location Hotel/ Location! 4 Example 1 - Step 1 Course No. Course Name No. 5 Example 1 - Step 2 COURSE 'EVENT OR COURSE •GIVING' COURSE Course No. Course Name No. 6 Example 1 - Step 3 The data Items are split, and one-to-many Relationships are created. 5. Course is an obvious choice for the first group of items, but the second group poses a problem. What is being described? The start and end date give the clue. g. Basic Systems, so the group of four data items describe an actual giving of the course.

Notice that we don't have individual diets for each animal. Notice also that we don't reserve animal areas for one animal type. This means that in practice we mix animals in an animal area (although obviously we use our common sense here). 48 Data Modelling Finally, it helps us to know which types of animal the keepers are capable of looking after. Each keeper may be looking after only a subset of this range of types at any one time. But it is useful to know, if a keeper leaves or is sick, who else is capable of looking after the animals which were in his care.

This often requires some thought. If you can't find a 'real world' name give it a name corresponding to any obvious important data items or groups of items. 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.

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