<?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>52.35. pg_opfamily</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-operator.html" title="52.34. pg_operator" /><link rel="next" href="catalog-pg-partitioned-table.html" title="52.36. pg_partitioned_table" /></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">52.35. <code xmlns="http://www.w3.org/1999/xhtml" class="structname">pg_opfamily</code></th></tr><tr><td width="10%" align="left"><a accesskey="p" href="catalog-pg-operator.html" title="52.34. pg_operator">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-partitioned-table.html" title="52.36. pg_partitioned_table">Next</a></td></tr></table><hr></hr></div><div class="sect1" id="CATALOG-PG-OPFAMILY"><div class="titlepage"><div><div><h2 class="title" style="clear: both">52.35. <code class="structname">pg_opfamily</code></h2></div></div></div><a id="id-1.10.4.37.2" class="indexterm"></a><p> The catalog <code class="structname">pg_opfamily</code> defines operator families. Each operator family is a collection of operators and associated support routines that implement the semantics specified for a particular index access method. Furthermore, the operators in a family are all <span class="quote">“<span class="quote">compatible</span>”</span>, in a way that is specified by the access method. The operator family concept allows cross-data-type operators to be used with indexes and to be reasoned about using knowledge of access method semantics. </p><p> Operator families are described at length in <a class="xref" href="xindex.html" title="38.15. Interfacing Extensions To Indexes">Section 38.15</a>. </p><div class="table" id="id-1.10.4.37.5"><p class="title"><strong>Table 52.35. <code class="structname">pg_opfamily</code> Columns</strong></p><div class="table-contents"><table class="table" summary="pg_opfamily 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">oid</code></td><td><code class="type">oid</code></td><td> </td><td>Row identifier (hidden attribute; must be explicitly selected)</td></tr><tr><td><code class="structfield">opfmethod</code></td><td><code class="type">oid</code></td><td><code class="literal"><a class="link" href="catalog-pg-am.html" title="52.3. pg_am"><code class="structname">pg_am</code></a>.oid</code></td><td>Index access method operator family is for</td></tr><tr><td><code class="structfield">opfname</code></td><td><code class="type">name</code></td><td> </td><td>Name of this operator family</td></tr><tr><td><code class="structfield">opfnamespace</code></td><td><code class="type">oid</code></td><td><code class="literal"><a class="link" href="catalog-pg-namespace.html" title="52.32. pg_namespace"><code class="structname">pg_namespace</code></a>.oid</code></td><td>Namespace of this operator family</td></tr><tr><td><code class="structfield">opfowner</code></td><td><code class="type">oid</code></td><td><code class="literal"><a class="link" href="catalog-pg-authid.html" title="52.8. pg_authid"><code class="structname">pg_authid</code></a>.oid</code></td><td>Owner of the operator family</td></tr></tbody></table></div></div><br class="table-break" /><p> The majority of the information defining an operator family is not in its <code class="structname">pg_opfamily</code> row, but in the associated rows in <a class="link" href="catalog-pg-amop.html" title="52.4. pg_amop"><code class="structname">pg_amop</code></a>, <a class="link" href="catalog-pg-amproc.html" title="52.5. pg_amproc"><code class="structname">pg_amproc</code></a>, and <a class="link" href="catalog-pg-opclass.html" title="52.33. pg_opclass"><code class="structname">pg_opclass</code></a>. </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="catalog-pg-operator.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-partitioned-table.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">52.34. <code class="structname">pg_operator</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> 52.36. <code class="structname">pg_partitioned_table</code></td></tr></table></div></body></html>
