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<?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>11.7. Indexes on Expressions</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="indexes-unique.html" title="11.6. Unique Indexes" /><link rel="next" href="indexes-partial.html" title="11.8. Partial Indexes" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">11.7. Indexes on Expressions</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="indexes-unique.html" title="11.6. Unique Indexes">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="indexes.html" title="Chapter 11. Indexes">Up</a></td><th width="60%" align="center">Chapter 11. Indexes</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.6 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="indexes-partial.html" title="11.8. Partial Indexes">Next</a></td></tr></table><hr /></div><div class="sect1" id="INDEXES-EXPRESSIONAL"><div class="titlepage"><div><div><h2 class="title" style="clear: both">11.7. Indexes on Expressions</h2></div></div></div><a id="id-1.5.10.10.2" class="indexterm"></a><p>
+<!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>11.7. Indexes on Expressions</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="indexes-unique.html" title="11.6. Unique Indexes" /><link rel="next" href="indexes-partial.html" title="11.8. Partial Indexes" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">11.7. Indexes on Expressions</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="indexes-unique.html" title="11.6. Unique Indexes">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="indexes.html" title="Chapter 11. Indexes">Up</a></td><th width="60%" align="center">Chapter 11. Indexes</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.7 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="indexes-partial.html" title="11.8. Partial Indexes">Next</a></td></tr></table><hr /></div><div class="sect1" id="INDEXES-EXPRESSIONAL"><div class="titlepage"><div><div><h2 class="title" style="clear: both">11.7. Indexes on Expressions</h2></div></div></div><a id="id-1.5.10.10.2" class="indexterm"></a><p>
An index column need not be just a column of the underlying table,
but can be a function or scalar expression computed from one or
more columns of the table. This feature is useful to obtain fast
@@ -46,4 +46,4 @@ CREATE INDEX people_names ON people ((first_name || ' ' || last_name));
and so the speed of the search is equivalent to any other simple index
query. Thus, indexes on expressions are useful when retrieval speed
is more important than insertion and update speed.
- </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="indexes-unique.html" title="11.6. Unique Indexes">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="indexes.html" title="Chapter 11. Indexes">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="indexes-partial.html" title="11.8. Partial Indexes">Next</a></td></tr><tr><td width="40%" align="left" valign="top">11.6. Unique Indexes </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.6 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 11.8. Partial Indexes</td></tr></table></div></body></html> \ No newline at end of file
+ </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="indexes-unique.html" title="11.6. Unique Indexes">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="indexes.html" title="Chapter 11. Indexes">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="indexes-partial.html" title="11.8. Partial Indexes">Next</a></td></tr><tr><td width="40%" align="left" valign="top">11.6. Unique Indexes </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.7 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 11.8. Partial Indexes</td></tr></table></div></body></html> \ No newline at end of file