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SAP Hana Dictionary Encoding(字典编码)

字典编码,列被分成了字典列和属性向量。加快了,数据检索。

列存储易于列操作(比如统计性别人数),行存储易于记录查询操作(比如,查询姓名后,查性别,年龄,住址能)

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