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&ensp;&ensp;&ensp;&ensp;1.5.6　数据库技术 
&ensp;&ensp;&ensp;&ensp;数据库技术研究的是如何科学地组织和存储数据，它是当代信息系统的基础。从20世纪50年代。下面小编给大家分享关系型数据库有哪些关系种类，希望能帮助到大家。 关系型数据库有哪些关系种类文档下载网址链接：</div></div><div class=\"download_card_btn download_card_btn_lb\"><div class=\"content_box_tj\"><span>推荐度：</span><img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\"></div><div class=\"downlod_btn_right demo_tc downlod_btn_right_lb\"><em class=\"downlod_icon\"></em>点击下载文档<span>文档为doc格式</span></div> </div></div></a>';
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