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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>37.53. transforms</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="infoschema-tables.html" title="37.52. tables" /><link rel="next" href="infoschema-triggered-update-columns.html" title="37.54. triggered_update_columns" /></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">37.53. <code xmlns="http://www.w3.org/1999/xhtml" class="literal">transforms</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="infoschema-tables.html" title="37.52. tables">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="information-schema.html" title="Chapter 37. The Information Schema">Up</a></td><th width="60%" align="center">Chapter 37. The Information Schema</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="infoschema-triggered-update-columns.html" title="37.54. triggered_update_columns">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="INFOSCHEMA-TRANSFORMS"><div class="titlepage"><div><div><h2 class="title" style="clear: both">37.53. <code class="literal">transforms</code></h2></div></div></div><p>
The view <code class="literal">transforms</code> contains information about the
transforms defined in the current database. More precisely, it contains a
row for each function contained in a transform (the <span class="quote">“<span class="quote">from SQL</span>”</span>
or <span class="quote">“<span class="quote">to SQL</span>”</span> function).
</p><div class="table" id="id-1.7.6.57.3"><p class="title"><strong>Table 37.51. <code class="literal">transforms</code> Columns</strong></p><div class="table-contents"><table class="table" summary="transforms Columns" border="1"><colgroup><col /><col /><col /></colgroup><thead><tr><th>Name</th><th>Data Type</th><th>Description</th></tr></thead><tbody><tr><td><code class="literal">udt_catalog</code></td><td><code class="type">sql_identifier</code></td><td>Name of the database that contains the type the transform is for (always the current database)</td></tr><tr><td><code class="literal">udt_schema</code></td><td><code class="type">sql_identifier</code></td><td>Name of the schema that contains the type the transform is for</td></tr><tr><td><code class="literal">udt_name</code></td><td><code class="type">sql_identifier</code></td><td>Name of the type the transform is for</td></tr><tr><td><code class="literal">specific_catalog</code></td><td><code class="literal">sql_identifier</code></td><td>Name of the database containing the function (always the current database)</td></tr><tr><td><code class="literal">specific_schema</code></td><td><code class="literal">sql_identifier</code></td><td>Name of the schema containing the function</td></tr><tr><td><code class="literal">specific_name</code></td><td><code class="literal">sql_identifier</code></td><td>
The <span class="quote">“<span class="quote">specific name</span>”</span> of the function. See <a class="xref" href="infoschema-routines.html" title="37.40. routines">Section 37.40</a> for more information.
</td></tr><tr><td><code class="literal">group_name</code></td><td><code class="literal">sql_identifier</code></td><td>
The SQL standard allows defining transforms in <span class="quote">“<span class="quote">groups</span>”</span>,
and selecting a group at run time. PostgreSQL does not support this.
Instead, transforms are specific to a language. As a compromise, this
field contains the language the transform is for.
</td></tr><tr><td><code class="literal">transform_type</code></td><td><code class="type">character_data</code></td><td>
<code class="literal">FROM SQL</code> or <code class="literal">TO SQL</code>
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