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Extending Informix®Beyond standard relational database objects, HCL Informix® can be extended to handle specialized data types, access methods, routines, and other objects. Informix® includes many built-in extensions that are fully integrated in the database server. Informix® also provides DataBlade® modules, which are packages of extended database objects for a particular purpose and that are installed separately from the database server. Alternatively, you can create your own user-defined objects for Informix®.
Creating extensionsYou can create user-defined data types, routines, access methods, and other database objects to suit your needs. You can use application programming interfaces to write user-defined routines and applications that access data in Informix® databases.
DataBlade® Developers KitThe DataBlade® Developers Kit (DBDK) guides contain information about the tools you can use to develop and package DataBlade® modules, which extend the functionality of HCL Informix® databases.
DataBlade® Module Development OverviewThe HCL Informix® DataBlade® module overview serves as an overview of the HCL Informix® DataBlade® module development process.
DataBlade® module concepts
DataBlade® module components
AggregatesAn aggregate is a set of functions that returns information about a set of query results.

Aggregates

An aggregate is a set of functions that returns information about a set of query results.

For example, the built-in SUM aggregate adds the values returned from a query and returns the result. An aggregate is invoked in SQL as a single function, but it is implemented as one or more support functions.

You can define two types of aggregates:

Built-in aggregates whose support functions are overloaded to work with extended data types
New, user-defined aggregates that implement user-defined routines.

The built-in aggregates are AVG, COUNT, MAX, MIN, SUM, RANGE, STDEV, and VARIANCE. The COUNT aggregate is defined for all data types. For more information about these aggregates, see the Informix® Guide to SQL: Syntax.

For more information about defining aggregates, see the Informix DataBlade® Developers Kit User's Guide.

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