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   3    This chapter provides general information about writing trigger functions.
   4    Trigger functions can be written in most of the available procedural
   5    languages, including
   6    <span class="application">PL/pgSQL</span> (<a class="xref" href="plpgsql.html" title="Chapter 41. PL/pgSQL — SQL Procedural Language">Chapter 41</a>),
   7    <span class="application">PL/Tcl</span> (<a class="xref" href="pltcl.html" title="Chapter 42. PL/Tcl — Tcl Procedural Language">Chapter 42</a>),
   8    <span class="application">PL/Perl</span> (<a class="xref" href="plperl.html" title="Chapter 43. PL/Perl — Perl Procedural Language">Chapter 43</a>), and
   9    <span class="application">PL/Python</span> (<a class="xref" href="plpython.html" title="Chapter 44. PL/Python — Python Procedural Language">PL/Python</a>).
  10    After reading this chapter, you should consult the chapter for
  11    your favorite procedural language to find out the language-specific
  12    details of writing a trigger in it.
  13   </p><p>
  14    It is also possible to write a trigger function in C, although
  15    most people find it easier to use one of the procedural languages.
  16    It is not currently possible to write a trigger function in the
  17    plain SQL function language.
  18   </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="extend-pgxs.html" title="36.18. Extension Building Infrastructure">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="server-programming.html" title="Part V. Server Programming">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="trigger-definition.html" title="37.1. Overview of Trigger Behavior">Next</a></td></tr><tr><td width="40%" align="left" valign="top">36.18. Extension Building Infrastructure </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 18.0 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 37.1. Overview of Trigger Behavior</td></tr></table></div></body></html>