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SQL programmingYou can use the HCL Informix® implementation of the SQL language to develop applications for Informix® database servers.
Guide to SQL: ReferenceThe Informix® Guide to SQL: Reference contains the reference information for the system catalog tables, data types, and environment variables of the HCL Informix® dialect of the SQL language, as implemented in HCL Informix®. These topics also include information about the stores_demo, sales_demo, and superstore_demo databases that are included with HCL Informix®.
Data typesEvery column in a table in a database is assigned a data type. The data type precisely defines the kinds of values that you can store in that column.
Extended Data Types

Extended Data Types

HCL Informix® enables you to create extended data types to characterize data that cannot easily be represented with the built-in data types. (You cannot, however, use extended data types in distributed transactions that query external tables.) You can create these categories of extended data types:

Complex data types
Distinct data types
Opaque data types

Sections that follow provide an overview of each of these data types.

For more information about extended data types, see the Informix Database Design and Implementation Guide and Informix User-Defined Routines and Data Types Developer's Guide.

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