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PostgreSQL 8.2.23 Documentation
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Chapter 34. Triggers

Table of Contents
34.1. Overview of Trigger Behavior
34.2. Visibility of Data Changes
34.3. Writing Trigger Functions in C
34.4. A Complete Example

This chapter provides general information about writing trigger functions. Trigger functions can be written in most of the available procedural languages, including PL/pgSQL (Chapter 37), PL/Tcl (Chapter 38), PL/Perl (Chapter 39), and PL/Python (Chapter 40). After reading this chapter, you should consult the chapter for your favorite procedural language to find out the language-specific details of writing a trigger in it.

It is also possible to write a trigger function in C, although most people find it easier to use one of the procedural languages. It is not currently possible to write a trigger function in the plain SQL function language.

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