SQL流式计算的相关内容

阿里云文档 2025-03-26

使用SQL创建数据集如何计算两个时间字段相差的秒数

概述本文主要描述了使用SQL创建数据集如何计算两个时间字段相差的秒数的方法。详细信息使用SQL创建数据集，按如下内容编辑：select timediff(live_name,I_live_name ) FROM student;适用于Quick BI

阿里云文档 2024-01-25

概述Dataphin某一时间开发环境在SQL计算任务中运行了一段SQL，如何查看该段SQL的运行记录。详细信息在开发 - 运行记录页面可以查看资产数据预览、数据处理、建模数据预览以及OpenAPI数据查询的运行记录，记录以天为粒度进行划分。相关文档运行记录适用于Dataphin

阿里云文档 2023-12-01

如何使用GeomGridSQL的ST_As3DGrid网格对象计算函数_RDS PostgreSQL数据库_云数据库 RDS(RDS)

将三维几何对象转换为地理网格表达。

阿里云文档 2022-09-27

问题描述Dataphin中SQL计算任务自动解析上游依赖失败，报错“xxx[Read time out]xxx”。问题原因解析上游依赖时出现该问题的原因一般为用户SQL代码过长，导致解析时间过长而超时。解决方案建议把代码拆分为多个部分，创建多个不同的计算任务，这样可读性也会好一些。适用于Dataph...

阿里云文档 2022-09-16

SQL计算任务报错ODPSpartitionexception-maximum60000partitionsallowed

问题描述Dataphin中SQL计算任务报错“ODPS partition exception - maximum 60000 partitions allowed”。问题原因该限制为MaxCompute的限制，是MaxCompute侧抛出的错误。解决方案1.适当删除分区。2.联系数据库侧同学评估是...

文章 2022-02-17 来自：开发者社区

使用Spark SQL进行流式机器学习计算（上）

作者：余根茂，阿里巴巴计算平台事业部EMR团队的技术专家，参与了Hadoop，Spark，Kafka等开源项目的研发工作。目前主要专注于EMR流式计算产品的研发工作。今天来和大家聊一下如何使用Spark SQL进行流式数据的机器学习处理。本文主要分为以下几个章节：什么是流式机器学习机器学习模型获取途径系统演示 1. 什么是流式机器学习通常，当我们听到有人提到实时数据机器学习时，其实...

文章 2022-02-16 来自：开发者社区

SQL流式案例 - 旋转门压缩(前后计算相关滑窗处理例子)

标签 PostgreSQL , 阅后即焚 , 流计算 , 旋转门压缩 , 滑窗分析 , 上下文相关滑窗 , 上下结果相关滑窗背景在流计算应用中，保持窗口和数据可重算（设置起点重新开始算）并覆盖已有计算结果。是两个比较特殊但又很有用的需求。例如流数据来自多个业务线，数据在现实中的发生有先后逻辑，然而由于系统的问题可能有数据到达差异，例如先发生的事情，数据反而后到达，（比如说订单，先下单，...

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