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<title>第十三章 数据库编程基础</title>
<meta name=Description content="2008-3-24: 13.1 数据库基础">
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left:10.11%;width:83.14%;height:7.0%'><span lang=EN-US style='font-family:
宋体;mso-ascii-font-family:宋体;font-size:82%;color:black;mso-color-index:1;
mso-fareast-language:ZH-CN'><b>13.1 数据库基础</b></span></div>
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position:absolute;top:23.75%;left:11.79%;width:73.03%;height:5.5%'><span
lang=EN-US style='font-family:宋体;mso-ascii-font-family:宋体;font-size:117%;
mso-fareast-language:ZH-CN'><b>13.1.1<span
style='mso-spacerun:yes'> </span>数据库技术的产生与发展</b></span></div>
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position:absolute;top:35.5%;left:11.79%;width:78.08%;height:6.0%'><span
lang=EN-US style='font-family:宋体;mso-ascii-font-family:宋体;font-size:117%;
mso-fareast-language:ZH-CN'><b>13.1.2</b></span><span lang=EN-US
style='font-size:117%;mso-fareast-language:ZH-CN'><b><span
style='mso-spacerun:yes'> </span></b></span><span
style='font-family:宋体;mso-ascii-font-family:宋体;mso-fareast-font-family:宋体;
font-size:117%'><b>数据库基本概念</b></span><span style='font-size:117%'><b> </b></span></div>
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style='position:absolute;top:47.0%;left:12.73%;width:96.62%;height:4.75%'><span
style='font-family:宋体;mso-ascii-font-family:宋体'><span
style='mso-spacerun:yes'> </span></span><span
style='font-family:宋体;mso-ascii-font-family:宋体;mso-fareast-font-family:宋体'><b>根据数据模型，即实现数据结构化所采用的联系方</b></span></span><span
style='position:absolute;top:53.75%;left:12.73%;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>式，数据库可以分为层次数据库、网状数据库和</b></span><span
style='font-family:宋体;mso-ascii-font-family:宋体;mso-fareast-font-family:宋体;
color:red'><b>关系数据</b></span></span><span style='position:absolute;top:59.75%;
left:12.73%;width:85.58%;height:5.25%'><span style='font-family:宋体;mso-ascii-font-family:
宋体;mso-fareast-font-family:宋体;color:red'><b>库</b></span><span
style='font-family:宋体;mso-ascii-font-family:宋体;mso-fareast-font-family:宋体'><b>。</b></span><b>
</b></span></div>
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style='font-family:宋体;mso-ascii-font-family:宋体;mso-fareast-font-family:宋体'><b>关系数据库的有关概念</b></span>
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