共查询到20条相似文献，搜索用时 62 毫秒
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本文针对目前流行的SQL查询语言的特点,根据作者长期的实践经验,总结了SQL查询中SELECT语句常用的方法和技巧,特别是将SQL查询的使用方法用较为详细的例子介绍给读者,供读者参考。 相似文献
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谢世煊 《漳州职业大学学报》2004,6(1):69-70
DELPHI与使用SQL语言的数据库管理系统完全兼容，因而，在使用DELPHI开发数据库应用程序时，可以使用SQL语言编程。介绍了在DELPHI中如何使用SQL语句。 相似文献
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Wang Jing 《石家庄铁路工程职业技术学院学报》2006,(1)
主要介绍利用DELPHI开发数据库管理系统程序时的几种数据库查询方式,重点说明这几种查询方式的应用与实现,及一些实现查询功能时所必须的系统提供的函数。 相似文献
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王静 《石家庄铁路职业技术学院学报》2006,5(1):116-120
主要介绍利用DELPHI开发数据库管理系统程序时的几种数据库查询方式，重点说明这几种查询方式的应用与实现，及一些实现查询功能时所必须的系统提供的函数。 相似文献
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谢世煊 《Journal of Zhangzhou Technical Institute》2004,6(1):69-70
DELPHI与使用 SQL语言的数据库管理系统完全兼容,因而,在使用 DELPHI开发数据库应用程序时,可以使用 SQL语言编程.介绍了在 DELPHI中如何使用 SQL语句. 相似文献
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汤化平 《温州职业技术学院学报》2002,2(1):46-47,50
在应用系统中，尤其在联机事务处理系统中，对数据查询及处理速度已成为衡量应用系统成败的标准。本文首先简要说明了查询优化技术的必要性和重要性；接着从索引的使用、相关子查询、ORDER BY语句的使用、IN和EXISTS的使用、临时表及避免困难的正规表达式等方面，阐述了在使用SQL语句时，如何写出高质量的查询语句的方法及手段。从而提高系统的可用性。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献