实时计算 Flink版group 的相关内容

Flink SQL GROUP BY后写入postgresql数据库主键如何实现业务场景需求呢？

SQL中对时间窗口和PRODUCT_ID进行了Group By聚合操作，PG数据表中的主键须设置为WINDOW_START /WINDOW_END和PRODUCT_ID，否则无法以upinsert方式写出数据，但是这样却无法满足业务场景的需求，业务上应以RANK_ID +WINDOW_ST...

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flink sql jdbc 只要含有group by 语句就会报错怎么办？

Flink 中该如何实现“Group By聚合操作”这个需求？

请问Flink streaming sql是否支持两层group by聚合啊？

我们有个streaming sql得到的结果不正确，现象是sink得到的数据一会大一会小，我们想确认下，这是否是个bug，或者flink还不支持这种sql。具体场景是：先group by A, B两个维度计算UV，然后再group by A 把维度B的UV sum起来，对应的SQL如下：（A -...

Flink SQL将group聚合的数据写入到HBase表报primary keys问题

各位好，最近在研究Flink Hbase连接器，测试实验是将聚合的数据写入到hbase报错。希望能得到各位的帮助。代码如下： /** @Author: ellis.guan @Description: HBase测试类 @Date: 2...

Apache Flink 1.13对于PyFlink Table API 在 Group 窗口有什么

Apache Flink 1.13对于PyFlink Table API 在 Group 窗口有什么升级？

使用Flink sql时,对table使用了group by操作。然后将结果转换为流时是不是只能使用

使用Flink sql时,对table使用了group by操作。然后将结果转换为流时是不是只能使用的toRetractStream方法不能使用toAppendStream方法。本问题来自阿里云开发者社区的【11大垂直技术领域开发者社群】。点击这里欢迎加入感兴趣的技术领域群。

Flink入坑指南第四章：SQL中的经典操作Group By+Agg

Flink入坑指南系列文章，从实际例子入手，一步步引导用户零基础入门实时计算/Flink，并成长为使用Flink的高阶用户。简介 Group By + Agg这个最经典的SQL使用方式。Group By是SQL中最基础的分组操作，agg的全称是aggregation(聚合操作)，是一类SQL算子的...

Flink SQL：在GROUP BY查询结果中重复分组键

我想在一个包含group by语句的表中在Flink SQL中进行简单查询。但是在结果中，group by语句中指定的列存在重复的行。那是因为我使用的是流媒体环境并且它不记得状态吗？ final StreamExecutionEnvironment env = StreamExecutionEnvi...

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实时计算Flink版

阿里云实时计算Flink版(Alibaba Cloud Realtime Compute)，完全兼容开源的Apache Flink，比开源性能提升2～3倍，提供了完整的告警、监控、日志的解决方案、提升开发效率且无运维成本，并有社区专家提供技术支持。

立即开通

产品控制台

产品文档

实时同步

MySQL 到 Hologres

Kafka 到 Hologres

功能对比

开源Flink对比

成本优化

作业自动调优