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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" xml:lang="en" lang="en"> <script src="./callback.js" type="text/javascript"></script> <noscript>Your browser does not support JavaScript. This help page requires JavaScript to render correctly.</noscript> </head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii" /> <meta http-equiv="Content-Style-Type" content="text/css" /> <meta http-equiv="Content-Script-Type" content="text/javascript" /> <meta name="generator" content="Oracle DARB XHTML Converter (Mode = ohj/ohw) - Version 5.1.1 Build 005" /> <meta name="date" content="2009-04-21T9:46:24Z" /> <meta name="robots" content="noarchive" /> <meta name="doctitle" content="About Collections" /> <meta name="relnum" content="11g Release 2 (11.2)" /> <meta name="partnum" content="E10766-01" /> <link rel="copyright" href="./dcommon/html/cpyr.htm" title="Copyright" type="text/html" /> <link rel="stylesheet" href="./dcommon/css/blafdoc.css" title="Oracle BLAFDoc" type="text/css" /> <link rel="contents" href="toc.htm" title="Contents" type="text/html" /> <link rel="prev" href="tdddg_subprograms042.htm" title="Previous" type="text/html" /> <link rel="next" href="tdddg_subprograms044.htm" title="Next" type="text/html" /> <title>About Collections</title> </head> <body> <div class="zz-skip-header"><a href="#BEGIN">Skip Headers</a></div> <table class="simple oac_no_warn" summary="" cellspacing="0" cellpadding="0" width="100%"> <col width="86%" /> <col width="*" /> <tr valign="bottom"> <td align="left"></td> <td align="center"><a href="tdddg_subprograms042.htm"><img width="24" height="24" src="./dcommon/gifs/leftnav.gif" alt="Previous" /><br /> <span class="icon">Previous</span></a> </td> <td align="center"><a href="tdddg_subprograms044.htm"><img width="24" height="24" src="./dcommon/gifs/rightnav.gif" alt="Next" /><br /> <span class="icon">Next</span></a></td> </tr> </table> <p><a id="BABGHDJD" name="BABGHDJD"></a><a id="TDDDG99952" name="TDDDG99952"></a></p> <div class="sect2"><!-- infolevel="all" infotype="General" --> <h1>About Collections</h1> <a name="BEGIN" id="BEGIN"></a> <p>A <a id="sthref490" name="sthref490"></a><span class="bold">collection</span> is a PL/SQL <a id="sthref491" name="sthref491"></a><a id="sthref492" name="sthref492"></a>composite variable that stores elements of the same type in a specified order, similar a one-dimensional array. The internal components of a collection are called <span class="bold">elements</span>. Each element has a unique subscript that identifies its position in the collection. To access a collection element, you use <a id="sthref493" name="sthref493"></a><span class="bold">subscript notation</span>: <code><span class="codeinlineitalic">collection_name</span></code>(<code><span class="codeinlineitalic">element_subscript</span></code>).</p> <p>You can treat collection elements like scalar variables. You can also pass entire collections as <a id="sthref494" name="sthref494"></a>subprogram parameters (if neither the sending nor receiving subprogram is a standalone subprogram).</p> <p>A <a id="sthref495" name="sthref495"></a><a id="sthref496" name="sthref496"></a><span class="bold">collection method</span> is a built-in PL/SQL subprogram that either returns information about a collection or operates on a collection. To invoke a collection method, you use <a id="sthref497" name="sthref497"></a><a id="sthref498" name="sthref498"></a><span class="bold">dot notation</span>: <code><span class="codeinlineitalic">collection_name</span></code>.<code><span class="codeinlineitalic">method</span></code>. For example, <code><span class="codeinlineitalic">collection_name</span></code>.<code>COUNT</code> returns the number of elements in the collection.</p> <p>PL/SQL has three types of collections:</p> <ul> <li> <p>Associative arrays (formerly called "PL/SQL tables" or "index-by tables")</p> </li> <li> <p><a id="sthref499" name="sthref499"></a>Nested tables</p> </li> <li> <p><a id="sthref500" name="sthref500"></a><a id="sthref501" name="sthref501"></a>Variable arrays (varrays)</p> </li> </ul> <p>This document explains only associative arrays.</p> <div class="helpinfonotealso"> <h2>Related Topics</h2> <p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=LNPLS00501','newWindow').focus()"><span class="italic">Oracle Database PL/SQL Language Reference</span></a> for more information about PL/SQL collection types</p> <p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=LNPLS00508','newWindow').focus()"><span class="italic">Oracle Database PL/SQL Language Reference</span></a> for more information about collection methods</p> <p><a href="tdddg_subprograms042.htm#BABDFGAA">Using Associative Arrays</a></p> </div> </div> <!-- class="sect2" --> <!-- Start Footer --> <div class="footer"> <table class="simple oac_no_warn" summary="" cellspacing="0" cellpadding="0" width="100%"> <col width="86%" /> <col width="*" /> <tr> <td align="left"><span class="copyrightlogo">Copyright © 1996, 2009, Oracle and/or its affiliates. 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