Chapter 7 - Storing organizational information - Databases. Define the fundamental concepts of the relational database model, evaluate the advantages of the relational database model, compare relational integrity constraints and business-critical integrity constraints, describe the benefits of a data driven website, describe the two primary methods for integrating information across multiple databases. | CHAPTER 7 Storing Organizational Information—Databases LEARNING OUTCOMES Define the fundamental concepts of the relational database model Evaluate the advantages of the relational database model Compare relational integrity constraints and business-critical integrity constraints LEARNING OUTCOMES Describe the benefits of a data driven website Describe the two primary methods for integrating information across multiple databases RELATIONAL DATABASE FUNDAMENTALS Information is everywhere in an organization Information is stored in databases Database – maintains information about various types of objects (inventory), events (transactions), people (employees), and places (warehouses) RELATIONAL DATABASE FUNDAMENTALS Database models include: Hierarchical database model – information is organized into a tree-like structure (using parent/child relationships) in such a way that it cannot have too many relationships Network database model – a flexible way of | CHAPTER 7 Storing Organizational Information—Databases LEARNING OUTCOMES Define the fundamental concepts of the relational database model Evaluate the advantages of the relational database model Compare relational integrity constraints and business-critical integrity constraints LEARNING OUTCOMES Describe the benefits of a data driven website Describe the two primary methods for integrating information across multiple databases RELATIONAL DATABASE FUNDAMENTALS Information is everywhere in an organization Information is stored in databases Database – maintains information about various types of objects (inventory), events (transactions), people (employees), and places (warehouses) RELATIONAL DATABASE FUNDAMENTALS Database models include: Hierarchical database model – information is organized into a tree-like structure (using parent/child relationships) in such a way that it cannot have too many relationships Network database model – a flexible way of representing objects and their relationships Relational database model – stores information in the form of logically related two-dimensional tables Entities and Attributes Entity – a person, place, thing, transaction, or event about which information is stored The rows in each table contain the entities In Figure CUSTOMER includes Dave’s Sub Shop and Pizza Palace entities Attributes (fields, columns) – characteristics or properties of an entity class The columns in each table contain the attributes In Figure attributes for CUSTOMER include Customer ID, Customer Name, Contact Name Keys and Relationships Primary keys and foreign keys identify the various entity classes (tables) in the database Primary key – a field (or group of fields) that uniquely identifies a given entity in a table Foreign key – a primary key of one table that appears an attribute in another table and acts to provide a logical relationship among the two tables Keys and Relationships Potential .
