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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® API Programmer's GuideThe Informix® DataBlade® API Programmer's Guide describes information about the DataBlade® API, the C-language application programming interface (API) provided with HCL Informix®.
Create user-defined routines
Create special-purpose UDRsThis section describes how to create special UDRs, such as iterator functions, user-defined aggregates, and optimization functions.
Write an aggregate functionAn aggregate is a function that returns one value for a group of queried rows. The aggregate function performs one iteration for each of the queried rows.
Creating a user-defined aggregate
Sample user-defined aggregates

Sample user-defined aggregates

This section provides the sample user-defined aggregates that the following table describes.


User-defined aggregate	Description
SUMSQ	Squares each value and calculates the sum of these squared values
SQSUM2	Sums all values and calculates the square of this sum
PERCENT_GTR	Determines the percentage of values greater than a user-specified value
X_PERCENTILE	Determines the value in a group of values that is the x-percentile, where x is a percent that the end user specifies.

Each description includes the aggregate support functions written in C and the SQL statements to define the user-defined aggregate in the database.

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