Computer Science Provide an ER model (entities, relationships, cardinalities, attributes) for the database of a smart- phone based messenger app. In the app data of personal contacts, chats with these contacts or in groups and per chat the messages will be stored. Contacts can have a name and a profile image. For a message the message’s text, date of sending and for sent messages also the status (received, read) will be stored and indicated. Messages can contain attachments such as images or documents. For each group chat also roles such as owner of the chat and administrator can be stored.

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Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.