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Decomposing Attributes to Data
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Once attributes of entities are identified, they must be reduced to data elements This process is called decomposing For the most part, decomposing is an intuitive process because you can easily recognize whether an attribute is already at an atomic level, as
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illustrated by the customer name and customer address attributes Both attributes are not atomic, but the atomic level is obvious first name, last name, city, state, and zip code However, decomposing other attributes might be less intuitive For example, should a customer number attribute be decomposed At first glance, the response is no because typically, a customer number is already atomic Consider the following customer number that consists of three numbered segments: 12-24-1001 The first segment (12) represents the sales region where the customer is located The second segment (24) is the branch in the sales region that handles the relationship with the customer And the final segment (1001) is the number that identifies the customer within the branch and region Since the customer number is in three segments, should the customer number attribute be decomposed into each segment This isn t an easy question to answer since in some systems it makes sense to further decompose the customer number attribute, and in other systems no further decomposition of the customer number is necessary The nature of the system will determine whether or not additional decomposition is required for an attribute For example, in this scenario the customer number probably should be further decomposed if the system references each segment of the customer number, such as using the first segment to select customers of a particular region Otherwise, the customer number should be treated as atomic
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How to Decompose Attributes
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The process of decomposing attributes begins by analyzing the list of entities and their attributes The list of attributes represents all the information used by the existing system The objective is to reduce each attribute to a list of data that represents the atomic level of the attribute Here s how to do this: 1 Look at each attribute and ask yourself if the attribute is atomic 2 If the attribute isn t atomic, it must be further decomposed Create a list of data derived from the attribute, as illustrated in Figure 9-5 3 If the attribute is atomic, no further decomposition is necessary for that attribute 4 Place the name of the attribute on the data list 5 Review the data list developed in step 2 and repeat the decomposition process until all attributes are atomic
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Computer-aided software engineering (CASE) tools are designed to automate the process of analyzing a system Oracle Designer/2000, Rational Rose, and Together J are three of the better CASE tools on the market A CASE tool transforms basic information that is entered into the tool into entities, attributes, data, and relationships among entities CASE tools are beyond the scope of this book Visit the manufacturers web sites for more information about CASE tools
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Figure 9-5
Data elements for the customer name attribute
Decomposing by Example
Let s work through an example of decomposing attributes using the customer address attribute of a customer entity The following are attributes for the customer entity: Customer number Customer name
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Customer address Customer telephone number Once the list of attributes is assembled, each attribute on the list must be decomposed The customer address attribute is decomposed in this example The same process can be applied to the other attributes Review the customer address attribute to determine whether the attribute is atomic, which it isn t Therefore, the customer address attribute must be decomposed into the following data elements: Street address 1 Street address 2 City State Country Country code
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