商业智能系统主要包括数据预处理、建立数据仓库、数据分析和数据展现四个主要阶段。其中，数据预处理主要包括（ ）；建立数据仓库是处理海量数据的基础；数据分析一般采用（ ）来实现；数据展现则主要是保障系统分析结果的可视化。
问题1选项
A.联机分析处理（OLAP）
B.联机事务处理（OLTP）
C.抽取、转换和加载（ETL）
D.数据聚集和汇总（DCS）
问题2选项
A.数据仓库和智能分析
B.数据抽取和报表分析
C.联机分析处理和数据挖掘
D.业务集成和知识形成与转化
正确答案及解析
正确答案
解析
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