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Databases - Coggle Diagram

- - - - They are read-only databases.
    - - They manage processes of updating, reorganizing, adding and deleting information
  - - - They contain various reading material
    - - They are handled with historical or documentary texts
- - - - Elements of a conceptual model
        
        Entity
        
        It is an object or element about which information can be stored
        
        Objects that have their own existence in accordance with the company's management decisions
        
        Relation
        
        It is the one that can associate two or more entities
        
        Cardinality
        
        Given a set of relationships in which two or more sets of entities participate
        
        Attributes
        
        It is the data that is saved from the entities and relationships
        
        Data types
        
        Yes/no
        
        Object OLE
        
        Date and time
        
        Currency
        
        1 more item...
        
        Attached data
        
        Memo (Long Text
        
        Text
        
        Autonumerical
        
        1 more item...