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Designing databasesThe first step in creating a relational database is to construct a data model, which is a precise, complete definition of the data you want to store. After you prepare your data model, you must implement it as a database and tables. To implement your data model, you first select a data type for each column and then you create a database and tables and populate the tables with data. You can also implement fragmentation strategies and control access to your data.
Designing and Implementing a DatabaseThe Informix® Database Design and Implementation Guide provides information to help you design, implement, and manage your Informix® databases. It includes data models that illustrate different approaches to database design and shows you how to use structured query language (SQL) to implement and manage your databases.
Basics of database design and implementation
Build a relational data model
Identify and define principal data objects
Discover entities
Telephone directory example
Generic and significant entities

Generic and significant entities

At first glance, the entities that are recorded in a telephone directory include the following items:

Names (of persons and organizations)
Addresses
Telephone numbers

Do these entities meet the earlier criteria? They are clearly significant to the model and are generic.

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