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  <section id="user-defined-functions">
<h1 id="udf--page-root">User-defined functions<a class="headerlink" href="#udf--page-root" title="Link to this heading">#</a></h1>
<p>A user-defined function (UDF) is a custom function authored by a user of Trino
in a client application. UDFs are scalar functions that return a single output
value, similar to <a class="reference internal" href="functions.html"><span class="doc std std-doc">built-in functions</span></a>.</p>
<p>More details are available in the following sections:</p>
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<li class="toctree-l1"><a class="reference internal" href="udf/introduction.html">Introduction to UDFs</a></li>
<li class="toctree-l1"><a class="reference internal" href="udf/function.html">FUNCTION</a></li>
<li class="toctree-l1"><a class="reference internal" href="udf/sql.html">SQL user-defined functions</a></li>
<li class="toctree-l1"><a class="reference internal" href="udf/python.html">Python user-defined functions</a></li>
</ul>
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