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<!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>53.57. 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="53.56. pg_tablespace" /><link rel="next" href="catalog-pg-trigger.html" title="53.58. pg_trigger" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">53.57. <code class="structname">pg_transform</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="catalog-pg-tablespace.html" title="53.56. pg_tablespace">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="catalogs.html" title="Chapter 53. System Catalogs">Up</a></td><th width="60%" align="center">Chapter 53. System Catalogs</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.7 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="catalog-pg-trigger.html" title="53.58. pg_trigger">Next</a></td></tr></table><hr /></div><div class="sect1" id="CATALOG-PG-TRANSFORM"><div class="titlepage"><div><div><h2 class="title" style="clear: both">53.57. <code class="structname">pg_transform</code></h2></div></div></div><a id="id-1.10.4.59.2" 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-1.10.4.59.4"><p class="title"><strong>Table 53.57. <code class="structname">pg_transform</code> Columns</strong></p><div class="table-contents"><table class="table" summary="pg_transform Columns" border="1"><colgroup><col /></colgroup><thead><tr><th class="catalog_table_entry"><p class="column_definition">
Column Type
</p>
<p>
Description
</p></th></tr></thead><tbody><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">oid</code> <code class="type">oid</code>
</p>
<p>
Row identifier
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">trftype</code> <code class="type">oid</code>
(references <a class="link" href="catalog-pg-type.html" title="53.64. pg_type"><code class="structname">pg_type</code></a>.<code class="structfield">oid</code>)
</p>
<p>
OID of the data type this transform is for
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">trflang</code> <code class="type">oid</code>
(references <a class="link" href="catalog-pg-language.html" title="53.29. pg_language"><code class="structname">pg_language</code></a>.<code class="structfield">oid</code>)
</p>
<p>
OID of the language this transform is for
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">trffromsql</code> <code class="type">regproc</code>
(references <a class="link" href="catalog-pg-proc.html" title="53.39. pg_proc"><code class="structname">pg_proc</code></a>.<code class="structfield">oid</code>)
</p>
<p>
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 the default behavior should be used.
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">trftosql</code> <code class="type">regproc</code>
(references <a class="link" href="catalog-pg-proc.html" title="53.39. pg_proc"><code class="structname">pg_proc</code></a>.<code class="structfield">oid</code>)
</p>
<p>
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 the default behavior should be used.
</p></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" title="53.56. pg_tablespace">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="catalogs.html" title="Chapter 53. System Catalogs">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="catalog-pg-trigger.html" title="53.58. pg_trigger">Next</a></td></tr><tr><td width="40%" align="left" valign="top">53.56. <code class="structname">pg_tablespace</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.7 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 53.58. <code class="structname">pg_trigger</code></td></tr></table></div></body></html>
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