榜单
服务器优惠
IT文库
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Selection
Selector Functions Selector Functions Currently, IoTDB supports the following selector functions: Function Name Allowed Input Series Data Types Required Attributes Output Serie... -
Selection
Selector Functions Selector Functions Currently, IoTDB supports the following selector functions: Function Name Allowed Input Series Data Types Required Attributes Output Serie... -
Continuous Query
Continuous Query(CQ) Introduction Syntax Descriptions of parameters in CQ syntax <start_time_offset> == <every_interval> <start_time_offset> > <every_interval> <start_time_o... -
Logical
Logical Operators Unary Logical Operators Binary Logical Operators Logical Operators Unary Logical Operators Supported operator ! Supported input data types: BOOLEAN Outp... -
Overview
Overview Syntax Definition Syntax Description SELECT clause INTO clause FROM clause WHERE clause GROUP BY clause HAVING clause ORDER BY clause FILL clause SLIMIT ... -
Logical
Logical Operators Unary Logical Operators Binary Logical Operators Logical Operators Unary Logical Operators Supported operator ! Supported input data types: BOOLEAN Outp... -
Keywords
Keywords and Reserved Words Keywords and Reserved Words The following list shows the keywords and reserved words in IoTDB 0.13. Reserved keywords are marked with (R) . Common ... -
聚合函数
聚合函数 聚合函数 聚合函数是多对一函数。它们对一组值进行聚合计算，得到单个聚合结果。 除了 COUNT() 之外，其他所有聚合函数都忽略空值，并在没有输入行或所有值为空时返回空值。 例如，SUM() 返回 null 而不是零，而 AVG() 在计数中不包括 null 值。 IoTDB 支持的聚合函数如下： 函数名 功能描述 允许的输入类型... -
基本概念
分布式 集群基本概念 名词解释 集群特点 分区策略 复制策略 共识协议（一致性协议） 分布式 集群基本概念 Apache IoTDB 集群版包含两种角色的节点，ConfigNode 和 DataNode，分别为不同的进程，可独立部署。 集群架构示例如下图： ConfigNode 是集群的控制节点，管理集群的节点状态、分区信息等，集... -
Status Codes
Status Codes Status Codes A sample solution as IoTDB requires registering the time series first before writing data is: try { writeData (); } catch ( SQLException...