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13 июл 2026, 17:47
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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>Part II. The SQL Language</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-conclusion.html" title="3.7. Conclusion" /><link rel="next" href="sql-syntax.html" title="Chapter 4. SQL Syntax" /></head><body id="docContent" class="container-fluid col-10"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="5" align="center">Part II. The SQL Language</th></tr><tr><td width="10%" align="left"><a accesskey="p" href="tutorial-conclusion.html" title="3.7. Conclusion">Prev</a> </td><td width="10%" align="left"><a accesskey="u" href="index.html" title="PostgreSQL 18.4 Documentation">Up</a></td><th width="60%" align="center">PostgreSQL 18.4 Documentation</th><td width="10%" align="right"><a accesskey="h" href="index.html" title="PostgreSQL 18.4 Documentation">Home</a></td><td width="10%" align="right"> <a accesskey="n" href="sql-syntax.html" title="Chapter 4. SQL Syntax">Next</a></td></tr></table><hr /></div><div class="part" id="SQL"><div class="titlepage"><div><div><h1 class="title">Part II. The SQL Language</h1></div></div></div><div class="partintro" id="id-1.5.2"><div></div><p>
    This part describes the use of the <acronym class="acronym">SQL</acronym> language
    in <span class="productname">PostgreSQL</span>.  We start with
    describing the general syntax of <acronym class="acronym">SQL</acronym>, then
    how to create tables, how to populate the database, and how to
    query it.  The middle part lists the available data types and
    functions for use in <acronym class="acronym">SQL</acronym> commands.  Lastly,
    we address several aspects of importance for tuning a database.
   </p><p>
    The information is arranged so that a novice user can
    follow it from start to end and gain a full understanding of the topics
    without having to refer forward too many times.  The chapters are
    intended to be self-contained, so that advanced users can read the
    chapters individually as they choose.  The information is presented
    in narrative form with topical units. Readers looking for a complete
    description of a particular command are encouraged to review
    the <a class="xref" href="reference.html" title="Part VI. Reference">Part VI</a>.
   </p><p>
    Readers should know how to connect to a
    <span class="productname">PostgreSQL</span> database and issue
    <acronym class="acronym">SQL</acronym> commands.  Readers that are unfamiliar with
    these issues are encouraged to read <a class="xref" href="tutorial.html" title="Part I. Tutorial">Part I</a>
    first.  <acronym class="acronym">SQL</acronym> commands are typically entered
    using the <span class="productname">PostgreSQL</span> interactive terminal
    <span class="application">psql</span>, but other programs that have
    similar functionality can be used as well.
   </p><div class="toc"><p><strong>Table of Contents</strong></p><dl class="toc"><dt><span class="chapter"><a href="sql-syntax.html">4. SQL Syntax</a></span></dt><dd><dl><dt><span class="sect1"><a hre … [Строка слишком длинная. Вы можете скачать файл]