我希望限制默认用户从特定数据库读取表,但revoke命令会给出以下异常。Code: 495. DB::Exception: Received from localhost:9000. DB::Exception: Cannot update user `default` in [users.xml] because this storage is readonly.
users.xml拥有666权限。我想知道如何
我试图插入时间戳类型,如果为空字符串,则将值设置为NULL。示例:error: column "timestamp_clmn" is of type timestamp without time zone butexpression is of type text
如何在时间戳字段上使用NULLIF?