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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>3.1. Introduction</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="tutorial-advanced.html" title="Chapter 3. Advanced Features" /><link rel="next" href="tutorial-views.html" title="3.2. Views" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">3.1. Introduction</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="tutorial-advanced.html" title="Chapter 3. Advanced Features">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="tutorial-advanced.html" title="Chapter 3. Advanced Features">Up</a></td><th width="60%" align="center">Chapter 3. Advanced Features</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="tutorial-views.html" title="3.2. Views">Next</a></td></tr></table><hr /></div><div class="sect1" id="TUTORIAL-ADVANCED-INTRO"><div class="titlepage"><div><div><h2 class="title" style="clear: both">3.1. Introduction</h2></div></div></div><p>
+    In the previous chapter we have covered the basics of using
+    <acronym class="acronym">SQL</acronym> to store and access your data in
+    <span class="productname">PostgreSQL</span>.  We will now discuss some
+    more advanced features of <acronym class="acronym">SQL</acronym> that simplify
+    management and prevent loss or corruption of your data.  Finally,
+    we will look at some <span class="productname">PostgreSQL</span>
+    extensions.
+   </p><p>
+    This chapter will on occasion refer to examples found in <a class="xref" href="tutorial-sql.html" title="Chapter 2. The SQL Language">Chapter 2</a> to change or improve them, so it will be
+    useful to have read that chapter.  Some examples from
+    this chapter can also be found in
+    <code class="filename">advanced.sql</code> in the tutorial directory.  This
+    file also contains some sample data to load, which is not
+    repeated here.  (Refer to <a class="xref" href="tutorial-sql-intro.html" title="2.1. Introduction">Section 2.1</a> for
+    how to use the file.)
+   </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="tutorial-advanced.html" title="Chapter 3. Advanced Features">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="tutorial-advanced.html" title="Chapter 3. Advanced Features">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="tutorial-views.html" title="3.2. Views">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 3. Advanced Features </td><td width="20%" align="center"><a accesskey="h" href="index.html" title="PostgreSQL 15.5 Documentation">Home</a></td><td width="40%" align="right" valign="top"> 3.2. Views</td></tr></table></div></body></html>
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