| 关系代数中“除法”运算与SQL中带有exists子查询的对比教学 |
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| 引用本文： | 肖海蓉.关系代数中“除法”运算与SQL中带有exists子查询的对比教学[J].电脑学习,2009(3):158-158. |
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| 作者姓名： | 肖海蓉 |
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| 作者单位： | 陕西理工学院计算机科学与技术系,汉中,723000 |
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| 基金项目： | 陕西理工学院重点课程项目 |
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| 摘 要： | 采用关系代数除法运算与SQL中带有exists子查询的对比教学法。使学生通过实例理解除法运算。加深了对SQL中带有exists子查询的用法，并掌握了两者之间的联系，取得了较好的教学效果。
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| 关 键 词： | 关系代数 除法运算 SQL exists子查询 |
Contradistinctive Teaching between Division Operation of Relational Algebra and existential Quantifier Query of SQL |
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| Xiao Hairong.Contradistinctive Teaching between Division Operation of Relational Algebra and existential Quantifier Query of SQL[J].Computer Study,2009(3):158-158. |
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| Authors: | Xiao Hairong |
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| Affiliation: | Xiao Hairong |
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| Abstract: | The paper adopts the contrdistinction teaching method between division operation of relational algebra and existential quantifier query of sql, which makes students understand division operation in a concrete example, deepen the usage of exitential quantifier query of sql,and master the interrelation, so achieve better teaching results. |
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| Keywords: | SQL |
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