6 37.1. Overview of Trigger Behavior
7 37.2. Visibility of Data Changes
8 37.3. Writing Trigger Functions in C
9 37.4. A Complete Trigger Example
11 This chapter provides general information about writing trigger
12 functions. Trigger functions can be written in most of the available
13 procedural languages, including PL/pgSQL (Chapter 41), PL/Tcl
14 (Chapter 42), PL/Perl (Chapter 43), and PL/Python (PL/Python). After
15 reading this chapter, you should consult the chapter for your favorite
16 procedural language to find out the language-specific details of
17 writing a trigger in it.
19 It is also possible to write a trigger function in C, although most
20 people find it easier to use one of the procedural languages. It is not
21 currently possible to write a trigger function in the plain SQL