Labels:chat room | crt screen | hakham | laptop | monitor | plant | road | sky | window OCR: SECTION CHAPTER 11 DATABASE MODELS What is the underlying structure ofa database? Computer data- bases evolved from manual filing systems filing cabinet full of folders and FIGURE 11-5 papers would be classified as an unstructured file because every docu- Database Models ment has unique structure and contains different kinds of data. For exam- ple some documents might be old receipts, others could be photos or Flat file product brochures, whereas other documents might be handwritten letters. Hierarchical database The electronic equivalent to this jumble of information might be the collec- tion of documents and graphics stored at a Web site. In contrast, library Networked database card catalogs and Rolodexes be classified as structured files Relational database structured file uses A unifor ...
