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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="2009-04-21T9:46:23Z" /> <meta name="robots" content="noarchive" /> <meta name="doctitle" content="About Queries" /> <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_selecting.htm" title="Previous" type="text/html" /> <link rel="next" href="tdddg_selecting002.htm" title="Next" type="text/html" /> <title>About Queries</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_selecting.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_selecting002.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="BCGBIFBJ" name="BCGBIFBJ"></a><a id="TDDDG22000" name="TDDDG22000"></a></p> <div class="sect1"><!-- infolevel="all" infotype="General" --> <h1>About Queries</h1> <a name="BEGIN" id="BEGIN"></a> <p><a id="sthref94" name="sthref94"></a><a id="sthref95" name="sthref95"></a>A <a id="sthref96" name="sthref96"></a><span class="bold">query</span>, or SQL <code>SELECT</code> statement, selects data from one or more tables or views.</p> <p><a id="sthref97" name="sthref97"></a>The simplest form of query has this syntax:</p> <pre xml:space="preserve" class="oac_no_warn"> <a id="sthref98" name="sthref98"></a>SELECT <span class="italic">select_list</span> FROM <span class="italic">source_list</span> </pre> <p>The <code><span class="codeinlineitalic">select_list</span></code> specifies the columns from which the data is to be selected, and the <code><span class="codeinlineitalic">source_list</span></code> specifies the tables or views that have these columns.</p> <p>A query nested within another SQL statement is called a <span class="bold"><a id="sthref99" name="sthref99"></a>subquery</span>.</p> <p>In the SQL*Plus environment, you can enter a query after the <code>SQL></code> prompt.</p> <p>In the SQL Developer environment, you can enter a query in the SQL Worksheet. For instructions, see <a href="tdddg_selecting002.htm#BCGHHIJG">"Running Queries in SQL Developer"</a>.</p> <div class="helpinfonote"> <p><span class="bold">Note: </span>When the result of a query is displayed, records can be in any order, unless you specify their order with the <code>ORDER</code> <code>BY</code> clause. For more information, see <a href="tdddg_selecting008.htm#BCGFEGCE">"Sorting Selected Data"</a>.</p> </div> <div class="helpinfonotealso"> <h2>Related Topics</h2> <p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=SQLRF007','newWindow').focus()"><span class="italic">Oracle Database SQL Language Reference</span></a> for more information about queries and subqueries</p> <p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=SQLRF01702','newWindow').focus()"><span class="italic">Oracle Database SQL Language Reference</span></a> for more information about the <code>SELECT</code> statement</p> <p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=SQPUG008','newWindow').focus()"><span class="italic">SQL*Plus User's Guide and Reference</span></a></p> <p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=RPTUG10700','newWindow').focus()"><span class="italic">Oracle Database SQL Developer User's Guide</span></a></p> <p><a href="tdddg_selecting.htm#CHDHHAFA">Selecting Table Data</a></p> </div> </div> <!-- class="sect1" --> <!-- 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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