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In an ER Diagram, a double ellipse is used to represent : 

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NIELIT Scientific Assistant CS 5 Dec 2021 Official Paper
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  1. Simple Attribute
  2. Composite Attribute
  3. Descriptive Attribute 
  4. Multi-valued Attribute

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Option 4 : Multi-valued Attribute
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<p>The correct answer is <u><strong>Multi-valued Attribute</strong></u>.</p><p><span><strong><span><u>Key Points</u></span></strong></span></p><ul> <li>A <strong>Multi-valued Attribute</strong> in an Entity-Relationship (ER) diagram is an attribute that can hold multiple values for a single entity. <ul> <li>In an ER diagram, a multi-valued attribute is represented by a double ellipse.</li> <li>For example, a person entity might have a multi-valued attribute "Phone Numbers" because a person can have more than one phone number.</li> <li>Multi-valued attributes are used to represent situations where an entity can have multiple instances of the same attribute.</li> <li>These attributes are essential for accurately modeling real-world scenarios where entities can possess multiple values for a particular attribute.</li> <li>Proper representation of multi-valued attributes helps in designing a normalized database schema.</li> </ul> </li> </ul><p><span><strong><span><u>Additional Information</u></span></strong></span></p><ul> <li>In database design, it's often necessary to create a separate table to handle multi-valued attributes to maintain normalization.</li> <li>Entity-Relationship diagrams are a vital tool for database design as they help visualize the relationships between different entities.</li> <li>Understanding how to represent different types of attributes in an ER diagram is crucial for designing efficient and accurate databases.</li> <li>Other attribute types in ER diagrams include simple attributes (represented by a single ellipse) and composite attributes (represented by an ellipse containing other ellipses).</li> </ul> - bijoux-oeil-de-tigre.com
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