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中文摘要：
课程中的重点、难点知识点如果能从多个角度解释、用多种方法求解,对学生掌握该知识点有极大帮助.通过论述数据库原理课程教学中关系运算中的除法和关系规范化理论中的候选码求解的多种解（算）法,使学生能够触类旁通、举一反三,更好地掌握该课程中这2个较难的知识点.
英文摘要：
There are great help for students to master the knowledge point of focus and difficult if teacher explain them from different angles and solve them with variety of methods.Discusses a variety of solutions（calculation） method of the division in the relationship operations and how to solve key code in the relationship normalization theory in the course of theory of database,so that students can comprehend by analogy and replicability and can better grasp the two difficult knowledge point.
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