| 关系代数中除法运算的教学探讨 |
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| 引用本文： | 陆熊,陈燕,黄晓梅,施玉霞.关系代数中除法运算的教学探讨[J].现代计算机,2011(10):42-44. |
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| 作者姓名： | 陆熊 陈燕 黄晓梅 施玉霞 |
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| 作者单位： | 南京航空航天大学自动化学院,南京,210016 |
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| 摘 要： | 从关系代数中除法运算的定义出发,以实例分析和图表表示为工具,通过类比整数的除法运算阐明关系除法运算的本质含义,并给出关系代数中除法运算的基本运算表达式。解决以往除法运算的抽象定义难以被学生理解的不足,促进学生对知识点的透彻理解,取得较好的教学效果。
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| 关 键 词： | 关系代数 除法运算 数据库系统 |
Research on Teaching Reformation of Division Operation in Relational Algebra |
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| LU Xiong,CHEN Yan,HUANG Xiao-mei,SHI Yu-xia.Research on Teaching Reformation of Division Operation in Relational Algebra[J].Modem Computer,2011(10):42-44. |
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| Authors: | LU Xiong CHEN Yan HUANG Xiao-mei SHI Yu-xia |
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| Affiliation: | (College of Automation Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016) |
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| Abstract: | Gives the definition of division operation in relational algebra,illustrates its calculating steps through examples and graphic tools,discusses this operation’s nature meaning by an analogy with integer division,and further expresses the division operation in terms of the basic algebra operators.This teaching reformation eliminates the students’ difficulties of understanding abstract concepts,helps students to thoroughly master the division operation,and is proved with better education effects. |
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| Keywords: | Relational Algebra Division Operation Database System |
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