SQL server 简介-毕业论文外文翻译

SQL server 简介-毕业论文外文翻译

ID:236111

大小:32.37 KB

页数:11页

时间:2017-07-11

SQL server 简介-毕业论文外文翻译_第1页
SQL server 简介-毕业论文外文翻译_第2页
SQL server 简介-毕业论文外文翻译_第3页
SQL server 简介-毕业论文外文翻译_第4页
SQL server 简介-毕业论文外文翻译_第5页
资源描述:

《SQL server 简介-毕业论文外文翻译》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库

1、外文原文IntroductiontoSQLServerBySamuelRelationaldatabaseshavebeenaroundfor30years,buttheywerenottheoriginalkindofdatabase,noraretheythenewestkindofdatabase.XMLandobject-orienteddatastructureshaveevolvedinrecentyears.Butrelationaldatabasesarestillbyfarthemostpopularkindofdatabasea

2、vailableandwillbeforsometimetocome.SQListheabbreviationofStructuredQueryLanguageanditisforrelationaldatabases,asthetitleindicatesthisisonlyforfresherwhohasjuststartedthecarrierorwhoiswaitingtoopenupthecarrierintheapplicationprogrammingside.Butthatdoesnotmeanthisarticleisatutor

3、ialforafresherwhodoesnotknowanythingaboutSQL.ThisarticleismeantforwhoalreadyhavealittleknowledgeinSQLandwanttoimproveit.WhatDoesSQLDo?First,SQListhepremiertoolforviewinginformationfromarelationaldatabase.Itdoesn’tjustgiveyouadatadump.SQLgivesyousophisticatedtoolstosummarize,co

4、nsolidate,andcalculatefromthedata.Usingtablerelationships,datacanbecombinedfrommultipletablesinanumberofways.Withaproperlydesigneddatabase,SQLcananswerpracticallyanyquestionaboutthedata.Second,SQLprovidescommandstomanipulatethedatainarelationaldatabase.Recordscanbeupdatedandad

5、dedtoordeletedfromatable.HereisSQLasadatabaselanguagereallyshines.Proceduralprogramminglanguages,suchasBASIC,mightrequireseverallinesofcodetoupdatearecordinadatabasetable.Inaddition,proceduralprogramminglanguageswouldhavetousesomesortofloopingstructuretorepeatthisprocessonever

6、yrecord.SQLoperatesonanentiresetofrecordsallatthesametime.SQLislikehaikuforprogrammers;oftenadozenwordsorfewercandeleteorchangethousandsofrecords.Finally,SQLisacompletedatadefinitionlanguage(DDL).Thedatabaseitselfcanbecreatedalongwithalltables,fields,primarykeys,andrelationshi

7、ps.Addtothattherecordinsertcommands,andyoucanhaveacompletedatabaseandallitsdataexpressedinprogrammingcode.Thisgreatlyenhancesadatabaseprogrammer’sabilitytoworkremotelyortoportdataenhancementsamongvariousinstallations.TheprerequisiteforlearningSQLisknowledgeinDiscreteMathematic

8、s(SetTheory,RelationsandFunctions).Althoughitisnotnecessaryto

当前文档最多预览五页,下载文档查看全文

此文档下载收益归作者所有

当前文档最多预览五页,下载文档查看全文
温馨提示:
1. 部分包含数学公式或PPT动画的文件,查看预览时可能会显示错乱或异常,文件下载后无此问题,请放心下载。
2. 本文档由用户上传,版权归属用户,天天文库负责整理代发布。如果您对本文档版权有争议请及时联系客服。
3. 下载前请仔细阅读文档内容,确认文档内容符合您的需求后进行下载,若出现内容与标题不符可向本站投诉处理。
4. 下载文档时可能由于网络波动等原因无法下载或下载错误,付费完成后未能成功下载的用户请联系客服处理。