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<title>第十三章  数据库编程基础</title>
<meta name=Description content=2008-3-24>
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 top:5.5%;left:8.42%;width:11.98%;height:5.25%'><nobr><span lang=EN-US
 style='font-family:"Times New Roman";mso-ascii-font-family:"Times New Roman";
 mso-fareast-font-family:"Arial Unicode MS";color:red;mso-fareast-language:
 ZH-CN'><b>5</b></span><span style='font-family:宋体;mso-ascii-font-family:宋体;
 mso-fareast-font-family:宋体;color:red'><b>．索引</b></span><span style='font-family:
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 <div style='mso-line-spacing:"125 30 0"'><span style='position:absolute;
 top:14.24%;left:8.42%;width:102.8%;height:4.75%'><span style='font-family:
 宋体;mso-ascii-font-family:宋体'><b><span
 style='mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;
 </span>为了提高数据库的访问效率，表中的记录应该按照一</b></span></span><span style='position:absolute;
 top:20.25%;left:8.42%;width:100.74%;height:5.25%'><span style='font-family:
 宋体;mso-ascii-font-family:宋体;mso-fareast-font-family:宋体'><b>定顺序排列，通常建立一个较小的表</b></span><span
 lang=EN-US style='mso-ascii-font-family:宋体;mso-fareast-language:ZH-CN'><b>——</b></span><span
 style='font-family:宋体;mso-ascii-font-family:宋体;mso-fareast-font-family:宋体'><b>索引表，该表中</b></span></span><span
 style='position:absolute;top:27.5%;left:8.42%;width:100.74%;height:4.75%'><span
 style='font-family:宋体;mso-ascii-font-family:宋体;mso-fareast-font-family:宋体'><b>只含有索引字段和记录号。通过索引表可以快速确定要访</b></span></span><span
 style='position:absolute;top:33.75%;left:8.42%;width:85.58%;height:5.25%'><span
 style='font-family:宋体;mso-ascii-font-family:宋体;mso-fareast-font-family:宋体'><b>问记录的位置。</b></span><b>
 </b></span></div>
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 position:absolute;top:50.24%;left:9.36%;width:80.71%;height:6.0%'><span
 lang=EN-US style='font-size:117%;mso-fareast-language:ZH-CN'><b>13.1.3<span
 style='mso-spacerun:yes'>&nbsp; </span>Visual Basic</b></span><span
 style='font-family:宋体;mso-ascii-font-family:宋体;mso-fareast-font-family:宋体;
 font-size:117%'><b>的数据库应用</b></span><span style='font-size:117%'><b> </b></span></div>
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 style='position:absolute;top:61.25%;left:11.79%;width:99.62%;height:5.25%'><b><span
 style='mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>Visual Basic</b><span
 style='font-family:宋体;mso-ascii-font-family:宋体;mso-fareast-font-family:宋体'><b>是一个功能强大的数据库开发平台，之所</b></span></span><span
 style='position:absolute;top:68.0%;left:11.79%;width:86.14%;height:5.25%'><span
 style='font-family:宋体;mso-ascii-font-family:宋体;mso-fareast-font-family:宋体'><b>以选择</b></span><span
 lang=EN-US style='mso-fareast-language:ZH-CN'><b>VB</b></span><span
 style='font-family:宋体;mso-ascii-font-family:宋体;mso-fareast-font-family:宋体'><b>作为开发数据库前台应用程序的工具。</b></span><b>
 </b></span></div>
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