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Mastering Data Modeling: A User-Driven Approach by John Carlis

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Chapter 9. One-Attribute Shapes

When you encounter an attribute, you should be able to say what kind of attribute it is. That is, you should know the attribute’s scale. An attribute’s scale constitutes a shape. Thus recognizing scale yields some of the same benefits as recognizing any other shape.

The rest of this chapter elaborates on the preceding paragraph and describes some common scales.

Scale

An attribute’s scale is a general classification of the kind of values it contains. For example, in LDS Fragment 9-1, the attributes team name and city are both nominal-scale attributes; each attribute has values that are names. The attribute place is an ordinal-scale attribute; its values are ordinal numbers (first, second, third, and so on). ...

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