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Deduplicating at query time can be achieved by grouping the data on the fields, which uniquely identify a row, and using the argMax function with a date field to identify the last value for other fields. ReplacingMergeTree allows rows with the same sorting key (ORDER BY key) to be deduplicated on merges. Note this is "best effort" only: sometimes parts will not be merged with the merge process scheduled at non-deterministic intervals. It, therefore, does not guarantee the absence of duplicates. Users can also utilize the FINAL modifier to force this deduplication at SELECT time. While FINAL does add overhead, it has received significant performance improvements in recent versions including multi-threaded processing, and is suitable for many production workloads.，这一点在新收录的资料中也有详细论述
Lex: FT’s flagship investment column，这一点在新收录的资料中也有详细论述
To move testing beyond my own ears, I asked a few other people, and most agreed that the Soundcore earbuds were better at noise cancellation. Based on these tests, I'm willing to say that these buds do a good job of blocking out noise.