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了解超置logog以估计基数
REDIS允许用户在消耗最小内存的同时有效地跟踪数据集中的独特项目。 · Google BigQuery提供了一个名为的内置函数APPROX_COUNT_DISTINCT,该功能使用超置logog来估计大数据集中不同项目的数量。 BigQuery通过使用HyperLoglog来提供高效的心脏估算,而无需全部数据来优化查询 ...
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