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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>53.20. pg_enum</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-description.html" title="53.19. pg_description" /><link rel="next" href="catalog-pg-event-trigger.html" title="53.21. pg_event_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">53.20. <code class="structname">pg_enum</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="catalog-pg-description.html" title="53.19. pg_description">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 16.3 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="catalog-pg-event-trigger.html" title="53.21. pg_event_trigger">Next</a></td></tr></table><hr /></div><div class="sect1" id="CATALOG-PG-ENUM"><div class="titlepage"><div><div><h2 class="title" style="clear: both">53.20. <code class="structname">pg_enum</code> <a href="#CATALOG-PG-ENUM" class="id_link">#</a></h2></div></div></div><a id="id-1.10.4.22.2" class="indexterm"></a><p>
The <code class="structname">pg_enum</code> catalog contains entries
showing the values and labels for each enum type. The
internal representation of a given enum value is actually the OID
of its associated row in <code class="structname">pg_enum</code>.
</p><div class="table" id="id-1.10.4.22.4"><p class="title"><strong>Table 53.20. <code class="structname">pg_enum</code> Columns</strong></p><div class="table-contents"><table class="table" summary="pg_enum 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">enumtypid</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>
The OID of the <a class="link" href="catalog-pg-type.html" title="53.64. pg_type"><code class="structname">pg_type</code></a> entry owning this enum value
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">enumsortorder</code> <code class="type">float4</code>
</p>
<p>
The sort position of this enum value within its enum type
</p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
<code class="structfield">enumlabel</code> <code class="type">name</code>
</p>
<p>
The textual label for this enum value
</p></td></tr></tbody></table></div></div><br class="table-break" /><p>
The OIDs for <code class="structname">pg_enum</code> rows follow a special
rule: even-numbered OIDs are guaranteed to be ordered in the same way
as the sort ordering of their enum type. That is, if two even OIDs
belong to the same enum type, the smaller OID must have the smaller
<code class="structfield">enumsortorder</code> value. Odd-numbered OID values
need bear no relationship to the sort order. This rule allows the
enum comparison routines to avoid catalog lookups in many common cases.
The routines that create and alter enum types attempt to assign even
OIDs to enum values whenever possible.
</p><p>
When an enum type is created, its members are assigned sort-order
positions 1..<em class="replaceable"><code>n</code></em>. But members added later might be given
negative or fractional values of <code class="structfield">enumsortorder</code>.
The only requirement on these values is that they be correctly
ordered and unique within each enum type.
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