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Update TAOS SQL-ch.md 

fix a mistake
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Xiaxin Li 2020-11-13 09:26:37 +08:00 committed by GitHub
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@ -90,7 +90,7 @@ TDengine缺省的时间戳是毫秒精度，但通过修改配置参数enableMic
```mysql ```mysql
ALTER DATABASE db_name REPLICA 2; ALTER DATABASE db_name REPLICA 2;
``` ```
REPLICA参数是指修改数据库副本数，取值范围[1, 3]。在集群中使用，副本数必须小于dnode的数目。 REPLICA参数是指修改数据库副本数，取值范围[1, 3]。在集群中使用，副本数必须小于或等于dnode的数目。
```mysql ```mysql
ALTER DATABASE db_name KEEP 365; ALTER DATABASE db_name KEEP 365;