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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>Alter Table Statement</title> <link rel="StyleSheet" href="css/text.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="text.23.01.html#107155">18 The Text Driver</a> : Alter Table Statement</div> <hr align="left" /> <blockquote> <div class="head_1"><a name="107155">Alter Table Statement</a></div> <div class="Body"><a name="107156">The Text driver supports the Alter Table statement to add one or more columns to a table or </a>to delete (drop) a single column.</div> <div class="Body"><a name="107157">The Alter Table statement has the form:</a></div> <div class="syntax_first"><a name="107158">ALTER TABLE </a><span class="EquationVariables">table_name</span> {ADD <span class="EquationVariables">column_name</span> <span class="EquationVariables">data_type </span>|</div> <div class="syntax"><a name="107159">ADD(</a><span class="EquationVariables">column_name</span> <span class="EquationVariables">data_type </span>[, <span class="EquationVariables">column_name</span> <span class="EquationVariables">data_type</span>]... ) |</div> <div class="syntax"><a name="107160">DROP[COLUMN] </a><span class="EquationVariables">column_name</span>}</div> <div class="Body"><span class="EquationVariables"><a name="107161">table_name</a></span> is the name of the table to which you are adding or dropping columns.</div> <div class="Body"><span class="EquationVariables"><a name="107162">column_name</a></span> assigns a name to the column you are adding or specifies the column you are dropping.</div> <div class="Body"><span class="EquationVariables"><a name="107163">data_type</a></span> specifies the native data type of each column you add.</div> <div class="Body"><a name="107164">For example, to add two columns to the emp table:</a></div> <div class="syntax_first"><a name="107165">ALTER TABLE emp (ADD startdate date, dept varchar(10))</a></div> <div class="Body"><a name="107166">You cannot add columns and drop columns in a single statement, and you can drop only </a>one column at a time. For example, to drop a column:</div> <div class="syntax_first"><a name="107167">ALTER TABLE emp DROP startdate</a></div> <div class="Body"><a name="107168">The Alter Table statement fails when you attempt to drop a column upon which other </a>objects, such as indexes or views, are dependent.</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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