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+<!DOCTYPE html>
+<html><head>
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<link href="sqlite.css" rel="stylesheet">
+<title>SQLite Documentation</title>
+<!-- path= -->
+</head>
+<body>
+<div class=nosearch>
+<a href="index.html">
+<img class="logo" src="images/sqlite370_banner.gif" alt="SQLite" border="0">
+</a>
+<div><!-- IE hack to prevent disappearing logo --></div>
+<div class="tagline desktoponly">
+Small. Fast. Reliable.<br>Choose any three.
+</div>
+<div class="menu mainmenu">
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+<li><a href="index.html">Home</a>
+<li class='mobileonly'><a href="javascript:void(0)" onclick='toggle_div("submenu")'>Menu</a>
+<li class='wideonly'><a href='about.html'>About</a>
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+<li class='search' id='search_menubutton'>
+<a href="javascript:void(0)" onclick='toggle_search()'>Search</a>
+</ul>
+</div>
+<div class="menu submenu" id="submenu">
+<ul>
+<li><a href='about.html'>About</a>
+<li><a href='docs.html'>Documentation</a>
+<li><a href='download.html'>Download</a>
+<li><a href='support.html'>Support</a>
+<li><a href='prosupport.html'>Purchase</a>
+</ul>
+</div>
+<div class="searchmenu" id="searchmenu">
+<form method="GET" action="search">
+<select name="s" id="searchtype">
+<option value="d">Search Documentation</option>
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+
+
+
+<div class="rightsidebar desktoponly border2px">
+<h3 align="center">Common Links</h3>
+<ul class=nounderline>
+<li> <a href="features.html">Features</a> </li>
+<li> <a href="whentouse.html">When to use SQLite</a> </li>
+<li> <a href="quickstart.html">Getting Started</a> </li>
+<li> <a href="https://sqlite.org/fiddle">Try it live!</li>
+<li> <a href="chronology.html">Prior Releases</a>
+<li> <a href="lang.html">SQL Syntax</a>
+<ul>
+<li> <a href="pragma.html#toc">Pragmas</a>
+<li> <a href="lang_corefunc.html">SQL functions</a>
+<li> <a href="lang_datefunc.html">Date &amp; time functions</a>
+<li> <a href="lang_aggfunc.html#aggfunclist">Aggregate functions</a>
+<li> <a href="windowfunctions.html#biwinfunc">Window functions</a>
+<li> <a href="lang_mathfunc.html">Math functions</a>
+<li> <a href="json1.html">JSON functions</a>
+</ul>
+</li>
+<li> <a href="c3ref/intro.html">C/C++ Interface Spec</a>
+<ul>
+<li> <a href="cintro.html">Introduction</a>
+<li> <a href="c3ref/funclist.html">List of C-language APIs</a>
+</ul>
+</li>
+<li> <a href="tclsqlite.html">The TCL Interface Spec</a>
+<li> <a href="quirks.html">Quirks and Gotchas</a> </li>
+<li> <a href="faq.html">Frequently Asked Questions</a> </li>
+<li> <a href="http://www.sqlite.org/src/timeline?n=100&y=ci">Commit History</a> </li>
+<li> <a href="http://www.sqlite.org/src/wiki?name=Bug+Reports">Bugs</a> </li>
+<li> <a href="news.html">News</a> </li>
+</ul>
+
+</div>
+
+<h2 align="center">Documentation</h1>
+<div class="docsearch" id="docsearch">
+ <form method="GET" action="./search">
+ <select name="s" id="searchtype">
+ <option value="d">Search Documentation</option>
+ <option value="c">Search Changelog</option>
+ </select>
+ <input type="text" name="q" id="searchbox">
+ <input type="submit" value="Go">
+ </form>
+</div>
+<style>
+.showhide {
+ margin-left: 0;
+ padding-left: 0;
+ list-style-type: none;
+}
+.showhide > li {
+ padding-left: 1em;
+ text-indent: -1em;
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+.showhide > li li {
+ padding-left: 0;
+ text-indent: 0;
+ padding-top: 1ex;
+ padding-bottom: 1ex;
+}
+.showhide ul {
+ display: none;
+ list-style-type: disc;
+}
+.showhide > li > a {
+ text-decoration: none;
+ color: black;
+ cursor: pointer;
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+.sh_mark {
+ width: 1em;
+}
+.sh_link {
+ font-weight: bold;
+}
+.docsearch {
+ margin: auto;
+ width: 450px;
+ padding-bottom: 1.5em;
+}
+</style>
+<script>
+function showhide(n){
+ var ul = document.getElementById("sh_sub_"+n)
+ var mk = document.getElementById("sh_mark_"+n)
+ if( ul.style.display!="block" ){
+ ul.style.display = "block";
+ mk.innerHTML = "&#x25bc;";
+ } else {
+ ul.style.display = "none";
+ mk.innerHTML = "&#x25ba;";
+ }
+}
+if( !location.origin || !location.origin.match || !location.origin.match(/http/) ){
+ document.getElementById("docsearch").style.display = "none";
+}
+</script>
+
+<ul class="showhide">
+<li><a onclick='showhide(1)'><span class='sh_mark' id='sh_mark_1'>&#x25bc;</span> Document Lists And Indexes</a>
+<ul id='sh_sub_1' style='display:block;'>
+<li><a class='sh_link' href='doclist.html'>Alphabetical Listing Of All Documents</a>
+<li><a class='sh_link' href='keyword_index.html'>Website Keyword Index</a>
+<li><a class='sh_link' href='sitemap.html'>Permuted Title Index</a>
+</ul>
+<li><a onclick='showhide(2)'><span class='sh_mark' id='sh_mark_2'>&#x25ba;</span> Overview Documents</a>
+<ul id='sh_sub_2'>
+<li><a class='sh_link' href='about.html'>About SQLite</a>
+<span class='desktoponly'>&rarr;
+ A high-level overview of what SQLite is and why you might be
+ interested in using it.
+</span>
+<li><a class='sh_link' href='whentouse.html'>Appropriate Uses For SQLite</a>
+<span class='desktoponly'>&rarr;
+ This document describes situations where SQLite is an appropriate
+ database engine to use versus situations where a client/server
+ database engine might be a better choice.
+</span>
+<li><a class='sh_link' href='different.html'>Distinctive Features</a>
+<span class='desktoponly'>&rarr;
+ This document enumerates and describes some of the features of
+ SQLite that make it different from other SQL database engines.
+</span>
+<li><a class='sh_link' href='quirks.html'>Quirks of SQLite</a>
+<span class='desktoponly'>&rarr;
+ This document is a short list of some unusual features of SQLite
+ that tend to cause misunderstandings and confusion. The list includes
+ both deliberate innovations and "misfeatures" that are retained only
+ for backwards compatibility.
+</span>
+<li><a class='sh_link' href='testing.html'>How SQLite Is Tested</a>
+<span class='desktoponly'>&rarr;
+ The reliability and robustness of SQLite is achieved in large part
+ by thorough and careful testing. This document identifies the
+ many tests that occur before every release of SQLite.
+</span>
+<li><a class='sh_link' href='copyright.html'>Copyright</a>
+<span class='desktoponly'>&rarr;
+ SQLite is in the public domain. This document describes what that means
+ and the implications for contributors.
+</span>
+<li><a class='sh_link' href='faq.html'>Frequently Asked Questions</a>
+<span class='desktoponly'>&rarr;
+ The title of the document says all...
+</span>
+<li><a class='sh_link' href='books.html'>Books About SQLite</a>
+<span class='desktoponly'>&rarr;
+ A list of independently written books about SQLite.
+</span>
+</ul>
+<li><a onclick='showhide(3)'><span class='sh_mark' id='sh_mark_3'>&#x25ba;</span> Programming Interfaces</a>
+<ul id='sh_sub_3'>
+<li><a class='sh_link' href='quickstart.html'>SQLite In 5 Minutes Or Less</a>
+<span class='desktoponly'>&rarr;
+ A very quick introduction to programming with SQLite.
+</span>
+<li><a class='sh_link' href='cintro.html'>Introduction to the C/C++ API </a>
+<span class='desktoponly'>&rarr;
+ This document introduces the C/C++ API. Users should read this document
+ before the C/C++ API Reference Guide linked below.
+</span>
+<li><a class='sh_link' href='howtocompile.html'>How To Compile SQLite</a>
+<span class='desktoponly'>&rarr;
+ Instructions and hints for compiling SQLite C code and integrating
+ that code with your own application.
+</span>
+<li><a class='sh_link' href='c3ref/intro.html'>C/C++ API Reference</a>
+<span class='desktoponly'>&rarr;
+ This document describes each API function separately.
+</span>
+<li><a class='sh_link' href='rescode.html'>Result and Error Codes</a>
+<span class='desktoponly'>&rarr;
+ A description of the meanings of the numeric result codes
+ returned by various C/C++ interfaces.
+</span>
+<li><a class='sh_link' href='lang.html'>SQL Syntax</a>
+<span class='desktoponly'>&rarr;
+ This document describes the SQL language that is understood by
+ SQLite.
+</span>
+<li><a class='sh_link' href='pragma.html'>Pragma commands</a>
+<span class='desktoponly'>&rarr;
+ This document describes SQLite performance tuning options and other
+ special purpose database commands.
+</span>
+<li><a class='sh_link' href='lang_corefunc.html'>Core SQL Functions</a>
+<span class='desktoponly'>&rarr;
+ General-purpose built-in scalar SQL functions.
+</span>
+<li><a class='sh_link' href='lang_aggfunc.html'>Aggregate SQL Functions</a>
+<span class='desktoponly'>&rarr;
+ General-purpose built-in aggregate SQL functions.
+</span>
+<li><a class='sh_link' href='lang_datefunc.html'>Date and Time SQL Functions</a>
+<span class='desktoponly'>&rarr;
+ SQL functions for manipulating dates and times.
+</span>
+<li><a class='sh_link' href='windowfunctions.html'>Window Functions</a>
+<span class='desktoponly'>&rarr;
+ SQL Window functions.
+</span>
+<li><a class='sh_link' href='gencol.html'>Generated Columns</a>
+<span class='desktoponly'>&rarr;
+ Stored and virtual columns in table definitions.
+</span>
+<li><a class='sh_link' href='http://system.data.sqlite.org/'>System.Data.SQLite</a>
+<span class='desktoponly'>&rarr;
+ C#/.NET bindings for SQLite
+</span>
+<li><a class='sh_link' href='tclsqlite.html'>Tcl API</a>
+<span class='desktoponly'>&rarr;
+ A description of the TCL interface bindings for SQLite.
+</span>
+<li><a class='sh_link' href='datatype3.html'>DataTypes</a>
+<span class='desktoponly'>&rarr;
+ SQLite version 3 introduces the concept of manifest typing, where the
+ type of a value is associated with the value itself, not the column that
+ it is stored in.
+ This page describes data typing for SQLite version 3 in further detail.
+</span>
+</ul>
+<li><a onclick='showhide(4)'><span class='sh_mark' id='sh_mark_4'>&#x25ba;</span> Extensions</a>
+<ul id='sh_sub_4'>
+<li><a class='sh_link' href='json1.html'>Json1 - JSON Integration</a>
+<span class='desktoponly'>&rarr;
+ SQL functions for creating, parsing, and querying JSON content.
+</span>
+<li><a class='sh_link' href='fts5.html'>FTS5 - Full Text Search</a>
+<span class='desktoponly'>&rarr;
+ A description of the SQLite Full Text Search (FTS5) extension.
+</span>
+<li><a class='sh_link' href='fts3.html'>FTS3 - Full Text Search</a>
+<span class='desktoponly'>&rarr;
+ A description of the SQLite Full Text Search (FTS3) extension.
+</span>
+<li><a class='sh_link' href='rtree.html'>R-Tree Module</a>
+<span class='desktoponly'>&rarr;
+ A description of the SQLite R-Tree extension. An R-Tree is a specialized
+ data structure that supports fast multi-dimensional range queries often
+ used in geospatial systems.
+</span>
+<li><a class='sh_link' href='sessionintro.html'>Sessions</a>
+<span class='desktoponly'>&rarr;
+ The Sessions extension allows change to an SQLite database to be
+ captured in a compact file which can be reverted on the original
+ database (to implement "undo") or transferred and applied to another
+ similar database.
+</span>
+<li><a class='sh_link' href='loadext.html'>Run-Time Loadable Extensions</a>
+<span class='desktoponly'>&rarr;
+ A general overview on how run-time loadable extensions work, how they
+ are compiled, and how developers can create their own run-time loadable
+ extensions for SQLite.
+</span>
+<li><a class='sh_link' href='http://sqlite.org/android/'>SQLite Android Bindings</a>
+<span class='desktoponly'>&rarr;
+ Information on how to deploy your own private copy of SQLite on
+ Android, bypassing the built-in SQLite, but using the same Java
+ interface.
+</span>
+<li><a class='sh_link' href='dbstat.html'>Dbstat Virtual Table</a>
+<span class='desktoponly'>&rarr;
+ The DBSTAT virtual table reports on the sizes and geometries of tables
+ storing content in an SQLite database, and is the basis for the
+ <a href="sqlanalyze.html">sqlite3_analyzer</a> utility program.
+</span>
+<li><a class='sh_link' href='csv.html'>Csv Virtual Table</a>
+<span class='desktoponly'>&rarr;
+ The CSV virtual table allows SQLite to directly read and query
+ <a href="https://www.ietf.org/rfc/rfc4180.txt">RFC 4180</a> formatted files.
+</span>
+<li><a class='sh_link' href='carray.html'>Carray</a>
+<span class='desktoponly'>&rarr;
+ CARRAY is a <a href="vtab.html#tabfunc2">table-valued function</a>
+ that allows C-language arrays to be used in SQL queries.
+</span>
+<li><a class='sh_link' href='series.html'>generate_series</a>
+<span class='desktoponly'>&rarr;
+ A description of the generate_series()
+ <a href="vtab.html#tabfunc2">table-valued function</a>.
+</span>
+<li><a class='sh_link' href='spellfix1.html'>Spellfix1</a>
+<span class='desktoponly'>&rarr;
+ The spellfix1 extension is an experiment in doing spelling correction
+ for <a href="fts3.html">full-text search</a>.
+</span>
+</ul>
+<li><a onclick='showhide(5)'><span class='sh_mark' id='sh_mark_5'>&#x25ba;</span> Features</a>
+<ul id='sh_sub_5'>
+<li><a class='sh_link' href='shortnames.html'>8+3 Filenames</a>
+<span class='desktoponly'>&rarr;
+ How to make SQLite work on filesystems that only support
+ 8+3 filenames.
+</span>
+<li><a class='sh_link' href='autoinc.html'>Autoincrement</a>
+<span class='desktoponly'>&rarr;
+ A description of the AUTOINCREMENT keyword in SQLite, what it does,
+ why it is sometimes useful, and why it should be avoided if not
+ strictly necessary.
+</span>
+<li><a class='sh_link' href='backup.html'>Backup API</a>
+<span class='desktoponly'>&rarr;
+ The <a href="c3ref/backup_finish.html">online-backup interface</a> can be
+ used to copy content from a disk file into an in-memory database or vice
+ versa and it can make a hot backup of a live database. This application
+ note gives examples of how.
+</span>
+<li><a class='sh_link' href='errlog.html'>Error and Warning Log</a>
+<span class='desktoponly'>&rarr;
+ SQLite supports an "error and warning log" design to capture information
+ about suspicious and/or error events during operation. Embedded applications
+ are encouraged to enable the error and warning log to help with debugging
+ application problems that arise in the field. This document explains how
+ to do that.
+</span>
+<li><a class='sh_link' href='foreignkeys.html'>Foreign Key Support</a>
+<span class='desktoponly'>&rarr;
+ This document describes the support for foreign key constraints introduced
+ in version 3.6.19.
+</span>
+<li><a class='sh_link' href='expridx.html'>Indexes On Expressions</a>
+<span class='desktoponly'>&rarr;
+ Notes on how to create indexes on expressions instead of just
+ individual columns.
+</span>
+<li><a class='sh_link' href='intern-v-extern-blob.html'>Internal versus External Blob Storage</a>
+<span class='desktoponly'>&rarr;
+ Should you store large BLOBs directly in the database, or store them
+ in files and just record the filename in the database? This document
+ seeks to shed light on that question.
+</span>
+<li><a class='sh_link' href='limits.html'>Limits In SQLite</a>
+<span class='desktoponly'>&rarr;
+ This document describes limitations of SQLite (the maximum length of a
+ string or blob, the maximum size of a database, the maximum number of
+ tables in a database, etc.) and how these limits can be altered at
+ compile-time and run-time.
+</span>
+<li><a class='sh_link' href='mmap.html'>Memory-Mapped I/O</a>
+<span class='desktoponly'>&rarr;
+ SQLite supports memory-mapped I/O. Learn how to enable memory-mapped
+ I/O and about the various advantages and disadvantages to using
+ memory-mapped I/O in this document.
+</span>
+<li><a class='sh_link' href='threadsafe.html'>Multi-threaded Programs and SQLite</a>
+<span class='desktoponly'>&rarr;
+ SQLite is safe to use in multi-threaded programs. This document
+ provides the details and hints on how to maximize performance.
+</span>
+<li><a class='sh_link' href='nulls.html'>Null Handling</a>
+<span class='desktoponly'>&rarr;
+ Different SQL database engines handle NULLs in different ways. The
+ SQL standards are ambiguous. This (circa 2003) document describes
+ how SQLite handles NULLs in comparison with other SQL database engines.
+</span>
+<li><a class='sh_link' href='partialindex.html'>Partial Indexes</a>
+<span class='desktoponly'>&rarr;
+ A partial index is an index that only covers a subset of the rows in
+ a table. Learn how to use partial indexes in SQLite from this document.
+</span>
+<li><a class='sh_link' href='sharedcache.html'>Shared Cache Mode</a>
+<span class='desktoponly'>&rarr;
+ Version 3.3.0 and later supports the ability for two or more
+ database connections to share the same page and schema cache.
+ This feature is useful for certain specialized applications.
+</span>
+<li><a class='sh_link' href='unlock_notify.html'>Unlock Notify</a>
+<span class='desktoponly'>&rarr;
+ The "unlock notify" feature can be used in conjunction with
+ <a href="sharedcache.html">shared cache mode</a> to more efficiently
+ manage resource conflict (database table locks).
+</span>
+<li><a class='sh_link' href='uri.html'>URI Filenames</a>
+<span class='desktoponly'>&rarr;
+ The names of database files can be specified using either an ordinary
+ filename or a URI. Using URI filenames provides additional capabilities,
+ as this document describes.
+</span>
+<li><a class='sh_link' href='withoutrowid.html'>WITHOUT ROWID Tables</a>
+<span class='desktoponly'>&rarr;
+ The WITHOUT ROWID optimization is a option that can sometimes result
+ in smaller and faster databases.
+</span>
+<li><a class='sh_link' href='wal.html'>Write-Ahead Log (WAL) Mode</a>
+<span class='desktoponly'>&rarr;
+ Transaction control using a write-ahead log offers more concurrency and
+ is often faster than the default rollback transactions. This document
+ explains how to use WAL mode for improved performance.
+</span>
+</ul>
+<li><a onclick='showhide(6)'><span class='sh_mark' id='sh_mark_6'>&#x25ba;</span> Tools</a>
+<ul id='sh_sub_6'>
+<li><a class='sh_link' href='cli.html'>Command-Line Shell (sqlite3.exe)</a>
+<span class='desktoponly'>&rarr;
+ Notes on using the "sqlite3.exe" command-line interface that
+ can be used to create, modify, and query arbitrary SQLite
+ database files.
+</span>
+<li><a class='sh_link' href='sqlanalyze.html'>SQLite Database Analyzer (sqlite3_analyzer.exe)</a>
+<span class='desktoponly'>&rarr;
+ This stand-alone program reads an SQLite database and outputs a file
+ showing the space used by each table and index and other statistics.
+ Built using the <a href="dbstat.html">dbstat virtual table</a>.
+</span>
+<li><a class='sh_link' href='rbu.html'>RBU</a>
+<span class='desktoponly'>&rarr;
+ The "Resumable Bulk Update" utility program allows a batch of changes
+ to be applied to a remote database running on embedded hardware in a
+ way that is resumeable and does not interrupt ongoing operation.
+</span>
+<li><a class='sh_link' href='sqldiff.html'>SQLite Database Diff (sqldiff.exe)</a>
+<span class='desktoponly'>&rarr;
+ This stand-alone program compares two SQLite database files and
+ outputs the SQL needed to convert one into the other.
+</span>
+<li><a class='sh_link' href='dbhash.html'>Database Hash (dbhash.exe)</a>
+<span class='desktoponly'>&rarr;
+ This program demonstrates how to compute a hash over the content
+ of an SQLite database.
+</span>
+<li><a class='sh_link' href='http://www.fossil-scm.org/'>Fossil</a>
+<span class='desktoponly'>&rarr;
+ The Fossil Version Control System is a distributed VCS designed specifically
+ to support SQLite development. Fossil uses SQLite as for storage.
+</span>
+<li><a class='sh_link' href='https://www.sqlite.org/sqlar/'>SQLite Archiver (sqlar.exe)</a>
+<span class='desktoponly'>&rarr;
+ A ZIP-like archive program that uses SQLite for storage.
+</span>
+</ul>
+<li><a onclick='showhide(7)'><span class='sh_mark' id='sh_mark_7'>&#x25ba;</span> Advocacy</a>
+<ul id='sh_sub_7'>
+<li><a class='sh_link' href='appfileformat.html'>SQLite As An Application File Format</a>
+<span class='desktoponly'>&rarr;
+ This article advocates using SQLite as an application file format
+ in place of XML or JSON or a "pile-of-file".
+</span>
+<li><a class='sh_link' href='famous.html'>Well Known Users</a>
+<span class='desktoponly'>&rarr;
+ This page lists a small subset of the many thousands of devices
+ and application programs that make use of SQLite.
+</span>
+<li><a class='sh_link' href='fasterthanfs.html'>35% Faster Than The Filesystem</a>
+<span class='desktoponly'>&rarr;
+ This article points out that reading blobs out of an SQLite database
+ is often faster than reading the same blobs from individual files in
+ the filesystem.
+</span>
+</ul>
+<li><a onclick='showhide(8)'><span class='sh_mark' id='sh_mark_8'>&#x25ba;</span> Technical and Design Documentation</a>
+<ul id='sh_sub_8'>
+<li><a class='sh_link' href='howtocorrupt.html'>How Database Corruption Can Occur</a>
+<span class='desktoponly'>&rarr;
+ SQLite is highly resistant to database corruption. But application,
+ OS, and hardware bugs can still result in corrupt database files.
+ This article describes many of the ways that SQLite database files
+ can go corrupt.
+</span>
+<li><a class='sh_link' href='tempfiles.html'>Temporary Files Used By SQLite</a>
+<span class='desktoponly'>&rarr;
+ SQLite can potentially use many different temporary files when
+ processing certain SQL statements. This document describes the
+ many kinds of temporary files that SQLite uses and offers suggestions
+ for avoiding them on systems where creating a temporary file is an
+ expensive operation.
+</span>
+<li><a class='sh_link' href='inmemorydb.html'>In-Memory Databases</a>
+<span class='desktoponly'>&rarr;
+ SQLite normally stores content in a disk file. However, it can also
+ be used as an in-memory database engine. This document explains how.
+</span>
+<li><a class='sh_link' href='atomiccommit.html'>How SQLite Implements Atomic Commit</a>
+<span class='desktoponly'>&rarr;
+ A description of the logic within SQLite that implements
+ transactions with atomic commit, even in the face of power
+ failures.
+</span>
+<li><a class='sh_link' href='malloc.html'>Dynamic Memory Allocation in SQLite</a>
+<span class='desktoponly'>&rarr;
+ SQLite has a sophisticated memory allocation subsystem that can be
+ configured and customized to meet memory usage requirements of the
+ application and that is robust against out-of-memory conditions and
+ leak-free. This document provides the details.
+</span>
+<li><a class='sh_link' href='custombuild.html'>Customizing And Porting SQLite</a>
+<span class='desktoponly'>&rarr;
+ This document explains how to customize the build of SQLite and
+ how to port SQLite to new platforms.
+</span>
+<li><a class='sh_link' href='lockingv3.html'>Locking And Concurrency<br>In SQLite Version 3</a>
+<span class='desktoponly'>&rarr;
+ A description of how the new locking code in version 3 increases
+ concurrency and decreases the problem of writer starvation.
+</span>
+<li><a class='sh_link' href='isolation.html'>Isolation In SQLite</a>
+<span class='desktoponly'>&rarr;
+ When we say that SQLite transactions are "serializable" what exactly
+ does that mean? How and when are changes made visible within the
+ same database connection and to other database connections?
+</span>
+<li><a class='sh_link' href='optoverview.html'>Overview Of The Optimizer</a>
+<span class='desktoponly'>&rarr;
+ A quick overview of the various query optimizations that are
+ attempted by the SQLite code generator.
+</span>
+<li><a class='sh_link' href='queryplanner-ng.html'>The Next-Generation Query Planner</a>
+<span class='desktoponly'>&rarr;
+ Additional information about the SQLite query planner, and in particular
+ the redesign of the query planner that occurred for version 3.8.0.
+</span>
+<li><a class='sh_link' href='arch.html'>Architecture</a>
+<span class='desktoponly'>&rarr;
+ An architectural overview of the SQLite library, useful for those who want
+ to hack the code.
+</span>
+<li><a class='sh_link' href='opcode.html'>VDBE Opcodes</a>
+<span class='desktoponly'>&rarr;
+ This document is an automatically generated description of the various
+ opcodes that the VDBE understands. Programmers can use this document as
+ a reference to better understand the output of EXPLAIN listings from
+ SQLite.
+</span>
+<li><a class='sh_link' href='vfs.html'>Virtual Filesystem</a>
+<span class='desktoponly'>&rarr;
+ The "VFS" object is the interface between the SQLite core and the
+ underlying operating system. Learn more about how the VFS object
+ works and how to create new VFS objects from this article.
+</span>
+<li><a class='sh_link' href='vtab.html'>Virtual Tables</a>
+<span class='desktoponly'>&rarr;
+ This article describes the virtual table mechanism and API in SQLite and how
+ it can be used to add new capabilities to the core SQLite library.
+</span>
+<li><a class='sh_link' href='fileformat2.html'>SQLite File Format</a>
+<span class='desktoponly'>&rarr;
+ A description of the format used for SQLite database and journal files, and
+ other details required to create software to read and write SQLite
+ databases without using SQLite.
+</span>
+<li><a class='sh_link' href='compile.html'>Compilation Options</a>
+<span class='desktoponly'>&rarr;
+ This document describes the compile time options that may be set to
+ modify the default behavior of the library or omit optional features
+ in order to reduce binary size.
+</span>
+<li><a class='sh_link' href='https://sqlite.org/android/'>Android Bindings for SQLite</a>
+<span class='desktoponly'>&rarr;
+ A description of how to compile your own SQLite for Android
+ (bypassing the SQLite that is built into Android) together with
+ code and makefiles.
+</span>
+<li><a class='sh_link' href='debugging.html'>Debugging Hints</a>
+<span class='desktoponly'>&rarr;
+ A list of tricks and techniques used to trace, examine, and understand
+ the operation of the core SQLite library.
+</span>
+</ul>
+<li><a onclick='showhide(9)'><span class='sh_mark' id='sh_mark_9'>&#x25ba;</span> Upgrading SQLite, Backwards Compatibility</a>
+<ul id='sh_sub_9'>
+<li><a class='sh_link' href='35to36.html'>Moving From SQLite 3.5 to 3.6</a>
+<span class='desktoponly'>&rarr;
+ A document describing the differences between SQLite version 3.5.9
+ and 3.6.0.
+</span>
+<li><a class='sh_link' href='34to35.html'>Moving From SQLite 3.4 to 3.5</a>
+<span class='desktoponly'>&rarr;
+ A document describing the differences between SQLite version 3.4.2
+ and 3.5.0.
+</span>
+<li><a class='sh_link' href='changes.html'>Release History</a>
+<span class='desktoponly'>&rarr;
+ A chronology of SQLite releases going back to version 1.0.0
+</span>
+<li><a class='sh_link' href='formatchng.html'>Backwards Compatibility</a>
+<span class='desktoponly'>&rarr;
+ This document details all of the incompatible changes to the SQLite
+ file format that have occurred since version 1.0.0.
+</span>
+<li><a class='sh_link' href='privatebranch.html'>Private Branches</a>
+<span class='desktoponly'>&rarr;
+ This document suggests procedures for maintaining a private branch
+ or fork of SQLite and keeping that branch or fork in sync with the
+ public SQLite source tree.
+</span>
+</ul>
+<li><a onclick='showhide(10)'><span class='sh_mark' id='sh_mark_10'>&#x25ba;</span> Obsolete Documents</a>
+<ul id='sh_sub_10'>
+<li><a class='sh_link' href='asyncvfs.html'>Asynchronous IO Mode</a>
+<span class='desktoponly'>&rarr;
+ This page describes the asynchronous IO extension developed alongside
+ SQLite. Using asynchronous IO can cause SQLite to appear more responsive
+ by delegating database writes to a background thread. <i>NB: This
+ extension is deprecated. <a href="wal.html">WAL mode</a> is recommended
+ as a replacement.</i>
+</span>
+<li><a class='sh_link' href='c_interface.html'>Version 2 C/C++ API</a>
+<span class='desktoponly'>&rarr;
+ A description of the C/C++ interface bindings for SQLite through version
+ 2.8
+</span>
+<li><a class='sh_link' href='datatypes.html'>Version 2 DataTypes </a>
+<span class='desktoponly'>&rarr;
+ A description of how SQLite version 2 handles SQL datatypes.
+ Short summary: Everything is a string.
+</span>
+<li><a class='sh_link' href='vdbe.html'>VDBE Tutorial</a>
+<span class='desktoponly'>&rarr;
+ The VDBE is the subsystem within SQLite that does the actual work of
+ executing SQL statements. This page describes the principles of operation
+ for the VDBE in SQLite version 2.7. This is essential reading for anyone
+ who want to modify the SQLite sources.
+</span>
+<li><a class='sh_link' href='version3.html'>SQLite Version 3</a>
+<span class='desktoponly'>&rarr;
+ A summary of the changes between SQLite version 2.8 and SQLite version 3.0.
+</span>
+<li><a class='sh_link' href='capi3.html'>Version 3 C/C++ API</a>
+<span class='desktoponly'>&rarr;
+ A summary of the API related changes between SQLite version 2.8 and
+ SQLite version 3.0.
+</span>
+<li><a class='sh_link' href='speed.html'>Speed Comparison</a>
+<span class='desktoponly'>&rarr;
+ The speed of version 2.7.6 of SQLite is compared against PostgreSQL and
+ MySQL.
+</span>
+</ul>
+
+</ul>
+<br clear="both">
+
+