SQL Procedures, Triggers, and Functions on IBM DB2 for i

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Functions

This chapter describes the advantages of developing user-defined functions (UDFs) on IBM DB2 for i as the facility to create scalar or table functions similar to another system-supplied function that can be used in Structured Query Language (SQL) statements.

This chapter includes the following topics:

•Introduction

•Nature of user-defined functions

•Types of user-defined functions

•Structure of an SQL UDF

•CREATE FUNCTION syntax for SQL scalar and table functions

•Resolving a UDF

•System catalog tables and views

•UDF examples

•UDF inlining ...

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