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MySQL 8.4 Reference Manual  /  ...  /  Replication and Fractional Seconds Support

19.5.1.15 复制和小数秒支持

MySQL 8.4 允许对TIME、DATETIME和TIMESTAMP值添加小数秒，精度最高到微秒（6位）。请参阅第13.2.6节，“时间值中的小数秒”。


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