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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
Translate E-R data objects into relational constructs
Determine keys for tables
Primary keys
Composite keys

Composite keys

Some entities lack features that are reliably unique. Different people can have identical names; different books can have identical titles. You can usually find a composite of attributes that work as a primary key. For example, people rarely have identical names and identical addresses, and different books rarely have identical titles, authors, and publication dates.

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