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   2 <!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-parameter-acl.html" title="52.36. pg_parameter_acl" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">52.35. <code 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 18.0 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="catalog-pg-parameter-acl.html" title="52.36. pg_parameter_acl">Next</a></td></tr></table><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> <a href="#CATALOG-PG-OPFAMILY" class="id_link">#</a></h2></div></div></div><a id="id-1.10.4.37.2" class="indexterm"></a><p>
   3    The catalog <code class="structname">pg_opfamily</code> defines operator families.
   4    Each operator family is a collection of operators and associated
   5    support routines that implement the semantics specified for a particular
   6    index access method.  Furthermore, the operators in a family are all
   7    <span class="quote">“<span class="quote">compatible</span>”</span>, in a way that is specified by the access method.
   8    The operator family concept allows cross-data-type operators to be used
   9    with indexes and to be reasoned about using knowledge of access method
  10    semantics.
  11   </p><p>
  12    Operator families are described at length in <a class="xref" href="xindex.html" title="36.16. Interfacing Extensions to Indexes">Section 36.16</a>.
  13   </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 /></colgroup><thead><tr><th class="catalog_table_entry"><p class="column_definition">
  14        Column Type
  15       </p>
  16       <p>
  17        Description
  18       </p></th></tr></thead><tbody><tr><td class="catalog_table_entry"><p class="column_definition">
  19        <code class="structfield">oid</code> <code class="type">oid</code>
  20       </p>
  21       <p>
  22        Row identifier
  23       </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
  24        <code class="structfield">opfmethod</code> <code class="type">oid</code>
  25        (references <a class="link" href="catalog-pg-am.html" title="52.3. pg_am"><code class="structname">pg_am</code></a>.<code class="structfield">oid</code>)
  26       </p>
  27       <p>
  28        Index access method operator family is for
  29       </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
  30        <code class="structfield">opfname</code> <code class="type">name</code>
  31       </p>
  32       <p>
  33        Name of this operator family
  34       </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
  35        <code class="structfield">opfnamespace</code> <code class="type">oid</code>
  36        (references <a class="link" href="catalog-pg-namespace.html" title="52.32. pg_namespace"><code class="structname">pg_namespace</code></a>.<code class="structfield">oid</code>)
  37       </p>
  38       <p>
  39        Namespace of this operator family
  40       </p></td></tr><tr><td class="catalog_table_entry"><p class="column_definition">
  41        <code class="structfield">opfowner</code> <code class="type">oid</code>
  42        (references <a class="link" href="catalog-pg-authid.html" title="52.8. pg_authid"><code class="structname">pg_authid</code></a>.<code class="structfield">oid</code>)
  43       </p>
  44       <p>
  45        Owner of the operator family
  46       </p></td></tr></tbody></table></div></div><br class="table-break" /><p>
  47    The majority of the information defining an operator family is not in its
  48    <code class="structname">pg_opfamily</code> row, but in the associated rows in
  49    <a class="link" href="catalog-pg-amop.html" title="52.4. pg_amop"><code class="structname">pg_amop</code></a>,
  50    <a class="link" href="catalog-pg-amproc.html" title="52.5. pg_amproc"><code class="structname">pg_amproc</code></a>,
  51    and
  52    <a class="link" href="catalog-pg-opclass.html" title="52.33. pg_opclass"><code class="structname">pg_opclass</code></a>.
  53   </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" title="52.34. pg_operator">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="catalogs.html" title="Chapter 52. System Catalogs">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="catalog-pg-parameter-acl.html" title="52.36. pg_parameter_acl">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" title="PostgreSQL 18.0 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 52.36. <code class="structname">pg_parameter_acl</code></td></tr></table></div></body></html>