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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.
Object-relational databases
Create and use extended data types in Informix®
Complex data types
Collection data types
Add a collection type to an existing table

Add a collection type to an existing table

You can use the ALTER TABLE statement to add or drop a column that is a collection type (or any other data type). For example, the following statement adds the flowers column, which is defined as a SET, to the nursery table:

ALTER TABLE nursery ADD flower SET(VARCHAR(30) NOT NULL)

You cannot modify an existing column that is a collection type or convert a non-collection type column into a collection type.

For more information about adding and dropping collection-type columns, see the ALTER TABLE statement in the Informix® Guide to SQL: Syntax.

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