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<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xml:lang="en" lang="en" xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html;charset=utf-8" /> <meta http-equiv="Content-Style-Type" content="text/css" /> <!-- MOTW-DISABLED saved from url=(0014)about:internet --> <title>Create and Drop Index Statements</title> <link rel="StyleSheet" href="css/btrieve.css" type="text/css" media="all" /> <link rel="StyleSheet" href="css/webworks.css" type="text/css" media="all" /> <script type="text/javascript" language="JavaScript1.2" src="wwhdata/common/context.js"></script> <script type="text/javascript" language="JavaScript1.2" src="wwhdata/common/towwhdir.js"></script> <script type="text/javascript" language="JavaScript1.2" src="wwhdata/common/wwhpagef.js"></script> <script type="text/javascript" language="JavaScript1.2"> <!-- var WebWorksRootPath = ""; // --> </script> <script type="text/javascript" language="JavaScript1.2"> <!-- // Set reference to top level help frame // var WWHFrame = WWHGetWWHFrame("", true); // --> </script> <script type="text/javascript" language="JavaScript1.2" src="scripts/expand.js"></script> </head> <body class="" style="background-color: #FFFFEE;" onload="WWHUpdate();" onunload="WWHUnload();" onkeydown="WWHHandleKeyDown((document.all||document.getElementById||document.layers)?event:null);" onkeypress="WWHHandleKeyPress((document.all||document.getElementById||document.layers)?event:null);" onkeyup="WWHHandleKeyUp((document.all||document.getElementById||document.layers)?event:null);"> <br /> <div class="WebWorks_Breadcrumbs" style="text-align: left;"> <a class="WebWorks_Breadcrumb_Link" href="btrieve.20.01.html#106721">15 The Btrieve (Pervasive.SQL) Driver</a> : Create and Drop Index Statements</div> <hr align="left" /> <blockquote> <div class="head_1"><a name="106721">Create and Drop Index Statements</a></div> <div class="Body"><a name="106722">The Btrieve driver supports SQL statements to create and delete indexes. </a></div> <div class="head_2"><a name="106723">Create Index</a></div> <div class="Body"><a name="106724">The Create Index statement for Btrieve files has the form:</a></div> <div class="syntax_first"><a name="106725">CREATE [UNIQUE] INDEX </a><span class="EquationVariables">index_name</span> ON <span class="EquationVariables">table_name</span><span style="font-style: italic;"> </span>([<span class="EquationVariables">field_name</span><span style="font-style: italic;"> </span>[ASC | DESC] [,<span class="EquationVariables">field_name</span> </div> <div class="syntax"><a name="106726">[ASC | DESC]]...)</a></div> <div class="Body"><a name="106727">Unique means that Btrieve does not let you insert two records with the same index values.</a></div> <div class="Body"><span class="EquationVariables"><a name="106728">index_name</a></span> is the name of the index.</div> <div class="Body"><span class="EquationVariables"><a name="106729">table_name</a></span> is the name of the table on which the index is to be created.</div> <div class="Body"><a name="106730">ASC tells Btrieve to create the index in ascending order. DESC tells Btrieve to create the </a>index in descending order. By default, indexes are created in ascending order. For example:</div> <div class="syntax_first"><a name="106731">CREATE INDEX lname ON emp (last_name)</a></div> <div class="head_2"><a name="106732">Drop Index</a></div> <div class="Body"><a name="106733">The form of the Drop Index statement is:</a></div> <div class="syntax_first"><a name="106734">DROP INDEX </a><span class="EquationVariables">table_name</span>.<span class="EquationVariables">index_name</span></div> <div class="Body"><span class="EquationVariables"><a name="106735">table_name</a></span> is the name of the table from which the index is to be dropped.</div> <div class="Body"><span class="EquationVariables"><a name="106736">index_name</a></span> is the name of the index.</div> <div class="Body"><a name="106737">For example:</a></div> <div class="syntax_first"><a name="106738">DROP INDEX emp.lname</a></div> <script type="text/javascript" language="JavaScript1.2"> <!-- // Clear related topics // WWHClearRelatedTopics(); document.writeln(WWHRelatedTopicsInlineHTML()); // --> </script> </blockquote> <script type="text/javascript" language="JavaScript1.2"> <!-- document.write(WWHRelatedTopicsDivTag() + WWHPopupDivTag() + WWHALinksDivTag()); // --> </script> </body> </html>
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