Identification of Attributes
Introduction of Attributes An attributes is a property or characteristic of an entity. An entity may contain any number of attributes . One of the attribute considered as the primary Key. Also we can explain like this, Attributes is entity are represented by means of their properties called attributes. In an entity - relational model, are represented in an elliptical shape. All attributes have values. There are several types of attribute in ER-modal. Types of Attributes Ø Simple Attributes : Simple attributes are atomic value, which cannot be further. For an example, a student phone number is an atomic value of 10 digits. Ø Composite Attributes : An attributes that can be split into components is a composite attributes. Ø Single-valued Attributes : The attribute which takes up only a single value for each entity instance is a single-valued attributes. For an example, the age of a student. Ø Multi-valued Attributes : The attributes w
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