diff options
Diffstat (limited to '')
| -rw-r--r-- | www/series.html | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/www/series.html b/www/series.html new file mode 100644 index 0000000..93595c4 --- /dev/null +++ b/www/series.html @@ -0,0 +1,213 @@ +<!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>The generate_series Table-Valued Function</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"> +<ul> +<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> +<li class='desktoponly'><a href="docs.html">Documentation</a> +<li class='desktoponly'><a href="download.html">Download</a> +<li class='wideonly'><a href='copyright.html'>License</a> +<li class='desktoponly'><a href="support.html">Support</a> +<li class='desktoponly'><a href="prosupport.html">Purchase</a> +<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> +<option value="c">Search Changelog</option> +</select> +<input type="text" name="q" id="searchbox" value=""> +<input type="submit" value="Go"> +</form> +</div> +</div> +<script> +function toggle_div(nm) { +var w = document.getElementById(nm); +if( w.style.display=="block" ){ +w.style.display = "none"; +}else{ +w.style.display = "block"; +} +} +function toggle_search() { +var w = document.getElementById("searchmenu"); +if( w.style.display=="block" ){ +w.style.display = "none"; +} else { +w.style.display = "block"; +setTimeout(function(){ +document.getElementById("searchbox").focus() +}, 30); +} +} +function div_off(nm){document.getElementById(nm).style.display="none";} +window.onbeforeunload = function(e){div_off("submenu");} +/* Disable the Search feature if we are not operating from CGI, since */ +/* Search is accomplished using CGI and will not work without it. */ +if( !location.origin || !location.origin.match || !location.origin.match(/http/) ){ +document.getElementById("search_menubutton").style.display = "none"; +} +/* Used by the Hide/Show button beside syntax diagrams, to toggle the */ +function hideorshow(btn,obj){ +var x = document.getElementById(obj); +var b = document.getElementById(btn); +if( x.style.display!='none' ){ +x.style.display = 'none'; +b.innerHTML='show'; +}else{ +x.style.display = ''; +b.innerHTML='hide'; +} +return false; +} +var antiRobot = 0; +function antiRobotGo(){ +if( antiRobot!=3 ) return; +antiRobot = 7; +var j = document.getElementById("mtimelink"); +if(j && j.hasAttribute("data-href")) j.href=j.getAttribute("data-href"); +} +function antiRobotDefense(){ +document.body.onmousedown=function(){ +antiRobot |= 2; +antiRobotGo(); +document.body.onmousedown=null; +} +document.body.onmousemove=function(){ +antiRobot |= 2; +antiRobotGo(); +document.body.onmousemove=null; +} +setTimeout(function(){ +antiRobot |= 1; +antiRobotGo(); +}, 100) +antiRobotGo(); +} +antiRobotDefense(); +</script> +<div class=fancy> +<div class=nosearch> +<div class="fancy_title"> +The generate_series Table-Valued Function +</div> +<div class="fancy_toc"> +<a onclick="toggle_toc()"> +<span class="fancy_toc_mark" id="toc_mk">►</span> +Table Of Contents +</a> +<div id="toc_sub"><div class="fancy-toc1"><a href="#overview">1. Overview</a></div> +<div class="fancy-toc2"><a href="#equivalent_recursive_common_table_expression">1.1. Equivalent Recursive Common Table Expression</a></div> +<div class="fancy-toc1"><a href="#usage_examples">2. Usage Examples</a></div> +</div> +</div> +<script> +function toggle_toc(){ +var sub = document.getElementById("toc_sub") +var mk = document.getElementById("toc_mk") +if( sub.style.display!="block" ){ +sub.style.display = "block"; +mk.innerHTML = "▼"; +} else { +sub.style.display = "none"; +mk.innerHTML = "►"; +} +} +</script> +</div> + + + + + +<h1 id="overview"><span>1. </span>Overview</h1> + +<p>The generate_series(START,END,STEP) <a href="vtab.html#tabfunc2">table-valued function</a> is a +<a href="loadext.html">loadable extension</a> included in the SQLite source tree, and compiled into +the <a href="cli.html">command-line shell</a>. The generate_series() table has a single +result column named "value" holding integer values +and a number of rows determined by the +parameters START, END, and STEP. The first row of the table has +a value of START. Subsequent rows increase by STEP up to END. + +</p><p>Omitted parameters take on default values. STEP defaults to 1. +END defaults to 9223372036854775807. The START parameter is required +as of version 3.37.0 (2021-11-27) and later and an error will +be raised if START is omitted or has a self-referential or otherwise +uncomputable value. Older versions used a default of 0 for START. +The legacy behavior can be obtained from recent code by compiling +with -DZERO_ARGUMENT_GENERATE_SERIES. + +</p><h2 id="equivalent_recursive_common_table_expression"><span>1.1. </span>Equivalent Recursive Common Table Expression</h2> + +<p>The generate_series table can be simulated using a +<a href="lang_with.html#recursivecte">recursive common table expression</a>. If the three parameters +are $start, $end, and $step, then the equivalent common table +expression is: + +</p><div class="codeblock"><pre>WITH RECURSIVE generate_series(value) AS ( + SELECT $start + UNION ALL + SELECT value+$step FROM generate_series + WHERE value+$step<=$end +) ... +</pre></div> + +<p>The common table expression works without having to load an +extension. On the other hand, the extension is easier to program +and faster. + +</p><h1 id="usage_examples"><span>2. </span>Usage Examples</h1> + +<p>Generate all multiples of 5 less than or equal to 100: + +</p><div class="codeblock"><pre>SELECT value FROM generate_series(5,100,5); +</pre></div> + +<p>Generate the 20 random integer values: + +</p><div class="codeblock"><pre>SELECT random() FROM generate_series(1,20); +</pre></div> + +<p>Find the name of every customer whose account number + is an even multiple of 100 between 10000 and 20000. + +</p><div class="codeblock"><pre>SELECT customer.name + FROM customer, generate_series(10000,20000,100) + WHERE customer.id=value; +/* or */ +SELECT name FROM customer + WHERE id IN (SELECT value + FROM generate_series(10000,20000,200)); +</pre></div> +<p align="center"><small><i>This page last modified on <a href="https://sqlite.org/docsrc/honeypot" id="mtimelink" data-href="https://sqlite.org/docsrc/finfo/pages/series.in?m=2ef7ed3d3eec2b729">2022-01-20 21:38:08</a> UTC </small></i></p> + |