Similarly a phone number can be divided into area

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Similarly, a phone number can be divided into Area code and Number. Ms-Nazia
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9 Single-Valued Attribute An attribute that may contain single value is called Single-valued attribute . For-Example: Age of a person is a single- valued attribute. Gender is also a single-valued attrbute. Ms-Nazia
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10 Multi-Valued Attribute An attribute that may contain two or more values is called multi-valued attribute . Multi-valued attribute is represented by double-line oval. For-Example: A person may have two or more college degrees. Similarly, an employee may have many skills. Ms-Nazia
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11 Stored Attribute An attribute that is stored in a database is called stored attribute . Most of the attributes are stored attributes. These are stored and accessed from database. Ms-Nazia
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12 Derived Attribute An attribute that is not stored in a database but derived from another value is called Derived attribute . The other values can be stored in the database or obtained in some other way. A derived attribute is indicated by using an ellipse with a dashed line. Ms-Nazia
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13 Derived Attribute cont.. For example: Roll no, name and Date of Birth of a student can be stored in database. The age of the student can be derived from Date of Birth.
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