By Rosemary Rock-Evans
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Extra resources for Data Modelling and Process Modelling. Using the Most Popular Methods
Hence no change Is needed. 5. 7. Course Λ^ Course Giving -4 Lecturer Course Course No. Course Name No. 8) 1. The block headed 'Students' Is repeated with respect to the top block. ' also repeats - notice the plural names. 9. LECHJRER'S STUDENT LIST [ Course No: Course Name: StartDate! End Date: STUDENTS Name Job Titie Description of Experience Been on one of our Courses before? 8 Example 2 - Form 2 Repeating Group Course No. 9 Example 2 - Step 1 Been on one of our Courses before? Course N a m e s / Dates How to do Data Modelling 61 2.
If they are in the database design we can assume that, until proved otherwise, there is a relationship between the corresponding entities which have been derived from the records in the database design. In other words, if Customer, Student, Course Giving and Student/Course Giving (an intersection Entity) become Entities, then there are Relationships between them, equivalent to the original sets. The degree of the Relationship will always be one-to-many because sets are always one-to-many. The 'optionality* of the Relationship can be partly deduced from the characteristics of the set.
Sex, for example, describes the sub-types of'Male* and Temale*. 22 (showing each of our recommended diagrammatic conventions). There is an advantage to the Information Engineering and Bachman style of showing sub-types, which is that more than one sub-type classification can be shown on the same Model. For example, all I need to do is hang another 'tree* from Person to show the sub-type 'employee' or 'not employee'. 24. This example shows the power that sub-types provide In expressing business rules.