A data warehouse is a subject-oriented data set used for reporting and analysis.Data warehouses can be subdivided into（）,which store subsets of data from a warehouse.
A.OLTPs
B.transactions
C.data marts
D.OLAPs
参考答案：C
解析：
数据市场(Data Mart)：服务于一个单位的某个部门的数据仓库和对数据限制较少的数据仓库工具。一个单位通常有若干个数据市场。Transactions事务。OLAP联机分析技术(On-Line Analytical Processing),OLTP(Online Transaction Processing)联机事务处理。
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