<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>52.55. pg_transform</title><link rel="stylesheet" type="text/css" href="stylesheet.css" /><link rev="made" href="pgsql-docs@lists.postgresql.org" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="prev" href="catalog-pg-tablespace.html" title="52.54. pg_tablespace" /><link rel="next" href="catalog-pg-trigger.html" title="52.56. pg_trigger" /></head><body><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">52.55. <code xmlns="http://www.w3.org/1999/xhtml" class="structname">pg_transform</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="catalog-pg-tablespace.html" title="52.54. pg_tablespace">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="catalogs.html" title="Chapter 52. System Catalogs">Up</a></td><th width="60%" align="center">Chapter 52. System Catalogs</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 11.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="catalog-pg-trigger.html" title="52.56. pg_trigger">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="CATALOG-PG-TRANSFORM"><div class="titlepage"><div><div><h2 class="title" style="clear: both">52.55. <code class="structname">pg_transform</code></h2></div></div></div><a id="id-1.10.4.57.2" class="indexterm"></a><p>
The catalog <code class="structname">pg_transform</code> stores information about
transforms, which are a mechanism to adapt data types to procedural
languages. See <a class="xref" href="sql-createtransform.html" title="CREATE TRANSFORM"><span class="refentrytitle">CREATE TRANSFORM</span></a> for more information.
</p><div class="table" id="id-1.10.4.57.4"><p class="title"><strong>Table 52.55. <code class="structname">pg_transform</code> Columns</strong></p><div class="table-contents"><table class="table" summary="pg_transform Columns" border="1"><colgroup><col /><col /><col /><col /></colgroup><thead><tr><th>Name</th><th>Type</th><th>References</th><th>Description</th></tr></thead><tbody><tr><td><code class="structfield">trftype</code></td><td><code class="type">oid</code></td><td><code class="literal"><a class="link" href="catalog-pg-type.html" title="52.62. pg_type"><code class="structname">pg_type</code></a>.oid</code></td><td>OID of the data type this transform is for</td></tr><tr><td><code class="structfield">trflang</code></td><td><code class="type">oid</code></td><td><code class="literal"><a class="link" href="catalog-pg-language.html" title="52.29. pg_language"><code class="structname">pg_language</code></a>.oid</code></td><td>OID of the language this transform is for</td></tr><tr><td><code class="structfield">trffromsql</code></td><td><code class="type">regproc</code></td><td><code class="literal"><a class="link" href="catalog-pg-proc.html" title="52.39. pg_proc"><code class="structname">pg_proc</code></a>.oid</code></td><td>
The OID of the function to use when converting the data type for input
to the procedural language (e.g., function parameters). Zero is stored
if this operation is not supported.
</td></tr><tr><td><code class="structfield">trftosql</code></td><td><code class="type">regproc</code></td><td><code class="literal"><a class="link" href="catalog-pg-proc.html" title="52.39. pg_proc"><code class="structname">pg_proc</code></a>.oid</code></td><td>
The OID of the function to use when converting output from the
procedural language (e.g., return values) to the data type. Zero is
stored if this operation is not supported.
</td></tr></tbody></table></div></div><br class="table-break" /></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="catalog-pg-tablespace.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="catalogs.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="catalog-pg-trigger.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">52.54. <code class="structname">pg_tablespace</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 52.56. <code class="structname">pg_trigger</code></td></tr></table></div></body></html>
