数据库嵌套查询技术的应用  

The Application of Database Nested Searching Technology

作　　者：吕振凯[1] 梁霞[1] 赵晓燕[1] 金明日[1] LV Zhen-kai, LIANG Xia, ZHAO Xiao-yan, JIN Ming-ri （Dalian Polytechnic University of Vocation ＆ Technology, Dalian 116100, China）

机构地区：[1]大连工业大学职业技术学院,辽宁大连116100

出　　处：《电脑知识与技术》2010年第2期769-771,共3页Computer Knowledge and Technology

摘　　要：查询是对数据库中的记录进行选择和投影运算，得到满足条件的记录，是对数据库进行数据检索最常用的方法。如何简化查询语句的编写，提高数据查询效率是我们关心的问题，嵌套查询是解决复杂查询并实现高效查询的有效方法。Searching is a kind of operation which can help us find the satisfactory records through doing choice and cast operations to the database records. It is the most efficient method of data searching to database. How to simplify the composing of searching sentences and how to improve the efficiency of data searching is the problem that we are concerned. Nest seaching is a kind of efficient method to.solve the complicated seaching and implement efficient searching.

关 键 词：嵌套查询 子查询 多表查询 

分 类 号：TP393[自动化与计算机技术—计算机应用技术;自动化与计算机技术—计算机科学与技术]