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【单选题】
数据集成的主要任务是( )。A.
将一种格式的数据转换为另一格式的数据 (如规范化)。
B.
去掉数据中的噪声，纠正不一致。
C.
通过聚集、删除冗余属性或聚类等方法来压 缩数据。
D.
将多个数据源合并成一致的数据存储，构成一个完整 的数据集，如数据仓库。
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