Describe techniques for extracting from heterogeneous data sources.简述异构数据源中的数据抽取技术。

题目

Describe techniques for extracting from heterogeneous data sources.

简述异构数据源中的数据抽取技术。

相似考题

1.异构数据源是指企业会计软件、ERP软件、管理软件等现有系统中存储的各种不同格式的数据。()此题为判断题(对，错)。

2.The term computer describes a device made up of a combination of electronic components．By itself, a computer has no (请作答此空) and is referred to as hardware, which means simply the physical equipment． The hardware can't be used until it is connected to other elements, all of which constitute the six parts of a computer-based information system,hardware,software,data/information, people, procedures and communications．A system is defined as a collection of related components that ( ) to perform a task in order to accomplish a goal． Any organization that uses information technology will have a computer-based information system to provide managers (and various categories of employees with the appropriate kind of information to help them make decisions．Systems analysis and design is to ascertain how a system works and then take steps to make it ( ) Often, a system approach is used to define, describe, and solve a problem or to meet a(an)（ ）From time to time, organizations need to ( )their information systems, in, responseto new marketing' opportunities, modified government regulations, the introduction ．of new technology, merger with another company, or other developments． When change is needed, the time is ripe for applying the principles of systems analysis and design．A.information B.software C.intelligence D.Data

3.The term computer describes a device made up of a combination of electronic components．By itself, a computer has no ( 1) and is referred to as hardware, which means simply the physical equipment． The hardware can't be used until it is connected to other elements, all of which constitute the six parts of a computer-based information system,hardware,software,data/information, people, procedures and communications．A system is defined as a collection of related components that ( 72) to perform a task in order to accomplish a goal． Any organization that uses information technology will have a computer-based information system to provide managers (and various categories of employees with the appropriate kind of information to help them make decisions．Systems analysis and design is to ascertain how a system works and then take steps to make it (73 ) Often, a system approach is used to define, describe, and solve a problem or to meet a(an)（ 74）From time to time, organizations need to (75 ) their information systems, in, response to new marketing' opportunities, modified government regulations, the introduction ．of new technology, merger with another company, or other developments． When change is needed, the time is ripe for applying the principles of systems analysis and design．（1）应选（ ）。A. information B. software C. intelligence D. Data

4.异构数据集成原型系统得核心是()。A数据源层B集成层C界面层D服务器层

更多“Describe techniques for extracting from heterogeneous data sources.简述异构数据源中的数 ”相关问题

  • 第1题：

    2、在T-SQL的查询语句中如要指定列的别名,以下中错误的是（）。

    A．select 列别名=原列名 from 数据源

    B．select 原列名 as 列别名 from 数据源

    C．select 原列名 列别名 from 数据源

    D．select 原列名 to 列别名 from 数据源


    D

  • 第2题：

    用SELECT-SQL 命令对数据进行查询时，SELECT 命令中 FROM 子句用来指定数据源表，（）子句用来筛选源表记录，Having 子句用来筛选结果记录。

    A．GROUP BY

    B．ORDER BY

    C．WHERE

    D．INTO


    WHERE

  • 第3题：

    4、Silk是一个基于Java开发的集成异构数据源的开源框架。


    B

  • 第4题：

    将数据库导入R语言后，可用（）显示数据库结构，用（）查看数据库行列数，用（）查看每个变量的基本统计值。

    A．str(data) summary(data) dim(data)

    B．str(data) dim(data) summary(data)

    C．dim(data) summary(data) str(data)

    D．summary(data) dim(data) str(data)


    str(data) dim(data) summary(data)

  • 第5题：

    常用缩写符号中#DATA代表16位立即数。


    错误

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