相关文档

• Query-Languages.ppt

  Click Keywordsbined with Boolean operators:OR: (e1 OR e2)AND: (e1 AND e2)BUT: (e1 BUT e2) Satisfy e1 but not e2Negation only allowed using BUT to allow efficient use of inverted index by filterin

• ch12-13 Query Processing & Query Optimization.ppt

  1查询处理和优化陈健 教授华南理工大学软件学院ellachen@陈健华南理工大学软件学院2简介查询处理:从查询语句出发，到获得查询结果的处理过程查询优化:根据数据的存储特点为查询语句确定合理的、有效的执行计划的技术查询优化是查询处理中的重要和必要的一环，对系统的性能影响颇大陈健华南理工大学软件学院3查询处理的基本步骤陈健华南理工大学软件学院41、语法分析与翻译器语法分析与翻译的过程类似于程序设计语

• ch13-14 Query Processing & Query Optimization.ppt

  1查询处理和优化陈健华南理工大学软件学院ellachen@陈健华南理工大学软件学院2简介查询处理:从查询语句出发，到获得查询结果的处理过程查询优化:根据数据的存储特点为查询语句确定合理的、有效的执行计划的技术查询优化是查询处理中的重要和必要的一环，对系统的性能影响颇大陈健华南理工大学软件学院3查询处理的基本步骤陈健华南理工大学软件学院41、语法分析与翻译器语法分析与翻译的过程类似于程序设计语言编译

• Language.ppt

  单击此处编辑母版标题样式单击此处编辑母版文本样式第二级第三级第四级第五级牛津深圳版九年级 Chapter 9LanguageTheparatives and superlatives of adverbse.g. Imaginary things can sometimes create excitement more easily than real ones.Adverbs tell

• Language.ppt

  单击此处编辑母版标题样式单击此处编辑母版文本样式第二级第三级第四级第五级单击此处编辑母版标题样式单击此处编辑母版文本样式第二级第三级第四级第五级Using AdjectiveUnit 2 Language 一 概述形容词表示人和事物的特征对名词起修饰和描绘作用在句中主要用作：1. 定语(修饰n.)2. 表语(系动词之后)1. This is an i

• LANGUAGE.ppt

  bear 表示忍受经得起时还常接 doing sth. 或that 从句I cant bear being kept waiting.我无法忍受人家叫我长时间等待He could not bear that his friends should laugh at him.他受不了朋友们嘲笑他

• U1 Language.ppt

  单击此处编辑母版标题样式单击此处编辑母版文本样式第二级第三级第四级第五级LanguageWhat is the boy doingHe is sleeping. He is dreaming.现在进行时：isaream doingWhat are they doingThey are seeing a film.现在进行时：isaream doingWhat were they doing f

• M6Unit4Using-language.ppt

  What can we doCareful - Reading1. Does Earth Care agree with Ouyang Guangs opinion that individuals can have no effect⑤Buy things made from recycled materials.

• Using-Language.ppt

  BelgiumA man in Belgium was arrested because police suspected that he had robbed a jewelry store. The man swore he did not do it. When the police asked if he had an alibi he explained that he had been

• U7-Language.ppt

  went ---gone现在完成时表示过去某一动作对现在的影响或过去某一动作持续到现在（可能会持续下去）【例句】I have been to have visited Hunan First Normal University. I have stayed there for 1 you ever visited GuangzhouYes I Ive never visited .自从……