Flink（十四）【Flink SQL（中）查询】（2）https://developer.aliyun.com/article/1532320 7、Order by 和 limit 1）order by 支持 Batch\Streaming，但在实时任务中一般用的非常少。实时任务中，Order By 子句中必须要有时间属性字段，并且必须写在最前面且为升序。 ...

文章 2024-06-07 来自：开发者社区

Flink（十四）【Flink SQL（中）查询】（2）

Flink（十四）【Flink SQL（中）查询】（1）https://developer.aliyun.com/article/1532319 4、特殊语法 - TopN 目前在Flink SQL中没有能够直接调用的TOP-N函数，而是提供了稍微复杂些的变通实现方法，是固定写法，特殊支持的over用法。 1）语法 ...

文章 2024-06-07 来自：开发者社区

Flink（十四）【Flink SQL（中）查询】（1）

前言接着上次写剩下的查询继续学习。 Flink SQL 查询环境准备： # 1. 先启动 hadoop myhadoop start # 2. 不需要启动 flink 只启动yarn-session即可...

文章 2024-06-07 来自：开发者社区

Flink（十三）【Flink SQL（上）SqlClient、DDL、查询】（4）

Flink（十三）【Flink SQL（上）SqlClient、DDL、查询】（3）https://developer.aliyun.com/article/1532278 5.5、分组聚合 SQL中一般所说的聚合我们都很熟悉，主要是通过内置的一些聚合函数来实现的，比如SUM()、MAX()、MIN()、AVG()以及COU...

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更新时间 2024-08-08 13:05:21

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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

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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