Study
CS-315 route
Unit 2 · Lesson 4 of 4 13 min

Data Models: Hierarchical, Network, Relational and Semi-Structured

Trees, webs, tables and self-describing documents, four ways of giving data a shape.

What this unit covers

Unit 2: Database Systems and Architecture

  1. 1 The File-Based Approach and the Database ApproachWhy every department keeping its own spreadsheet ends with three different phone numbers for the same student. · 12 min
  2. 2 Components of a Database System and Functions of a DBMSHardware, software, data, procedures and people, and the quiet list of jobs the DBMS does for all of them. · 12 min
  3. 3 The ANSI/SPARC Three-Schema Architecture and Data IndependenceThree views of the same data, so the storage can change without breaking a single app. · 12 min
  4. 4 Data Models: Hierarchical, Network, Relational and Semi-StructuredTrees, webs, tables and self-describing documents, four ways of giving data a shape. · 13 min