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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>51.55. 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 V1.79.1" /><link rel="prev" href="catalog-pg-tablespace.html" title="51.54. pg_tablespace" /><link rel="next" href="catalog-pg-trigger.html" title="51.56. pg_trigger" /></head><body id="docContent" class="container-fluid col-10"><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">51.55. <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="51.54. pg_tablespace">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="catalogs.html" title="Chapter 51. System Catalogs">Up</a></td><th width="60%" align="center">Chapter 51. System Catalogs</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 13.1 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="catalog-pg-trigger.html" title="51.56. 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">51.55. <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 51.55. <code class="structname">pg_transform</code> Columns</strong></p><div class="table-contents"><table class="table" summary="pg_transform Columns" border="1"><colgroup><col /></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="51.62. 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="51.29. 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="51.38. 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 this operation is not supported.
      </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="51.38. 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 this operation is not supported.
      </p></td></tr></tbody></table></div></div><br class="table-break" /></div><div xmlns="http://www.w3.org/TR/xhtml1/transitional" class="navfooter"><hr></hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="catalog-pg-tablespace.html" title="51.54. pg_tablespace">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="catalogs.html" title="Chapter 51. System Catalogs">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="catalog-pg-trigger.html" title="51.56. pg_trigger">Next</a></td></tr><tr><td width="40%" align="left" valign="top">51.54. <code xmlns="http://www.w3.org/1999/xhtml" class="structname">pg_tablespace</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 13.1 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 51.56. <code xmlns="http://www.w3.org/1999/xhtml" class="structname">pg_trigger</code></td></tr></table></div></body></html>