大数据开发SQL 的相关内容

阿里云文档 2025-04-23

SparkSQL开发

本文介绍如何在阿里云EMR Serverless Spark环境中开发SparkSQL任务，并指导您如何访问Spark UI以查看任务详情。

阿里云文档 2025-04-16

如何创建SelectDB集群

云数据库 SelectDB 版通过集群粒度实现算力隔离，多个集群可以分别用于不同的工作负载（例如读写数据），以满足各个业务的不同性能规模和使用时长需求。本文介绍如何在云数据库 SelectDB 版实例中新建集群。

阿里云文档 2025-02-25

SparkSQL任务快速入门

EMR Serverless Spark支持通过SQL代码编辑和运行任务。本文带您快速体验SQL的创建、启动和运维等操作。

阿里云文档 2024-10-18

配置NL2SQL服务

查询分析服务中的NL2SQL提供将自然语言查询转换为SQL语句的能力，本文介绍如何配置查询分析-NL2SQL服务。

文章 2024-09-08 来自：开发者社区

大数据开发SQL代码编码原则和规范

编码原则SQL代码的编码原则如下：代码功能完善。代码效果参考：http://www.603393.com/sitemap/post.html 代码行清晰、整齐，代码行的整体层次分明、结构化强。代码编写充分考虑执行速度最优的原则。代码中需要添加必要的注释，以增强代码的可读性。规范要求并非强制性约束开发人员的代码编写行为。实际应用中&#...

阿里云文档 2024-07-17

Flink SQL开发调优实践

说明实时计算Flink版控制台界面和功能可能会发生变化，具体请以实际控制台为准。

问答 2024-04-17 来自：开发者社区

大数据计算MaxCompute开发执行SQL可以选用闲时版嘛？

问答 2023-07-31 来自：开发者社区

大数据计算MaxCompute 中datawords可以支持导出开发的sql文件吗？

文章 2023-05-15 来自：开发者社区

使用索引索引是用来提高数据库查询效率的一种技术。使用索引可以减少数据的扫描次数，从而提高查询效率。在设计表结构时，应该为经常被查询的字段添加索引。避免使用子查询子查询是查询中嵌套的另一个查询，在处理大量数据时会极大地影响查询效率。因此，应该尽量避免使用子查询，可以考虑使用联合查询或者临时表等方法代替子查询。减少数据传输量在查询时，应该尽可能避免返回不必要的字段和数据，以减少数据传输量和查询时间。....

文章 2023-05-14 来自：开发者社区

大数据开发基础的数据库基础的SQL语句书写

SQL语言是由若干个关键字和特殊字符组成的命令集合，用于定义和操作关系型数据库中的数据。SQL语句可以分为数据定义语言（DDL）、数据查询语言（DQL）、数据操作语言（DML）和数据控制语言（DCL）等不同类型。在SQL语句的书写过程中，我们需要注意以下几点：关键字不区分大小写，但建议使用大写字母进行书写。SQL语句以分号（;）结尾。在进行表名、列名等标识符的书写时，建议使用反引号将其包含起来，....

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云数据库 RDS SQL Server 版

云数据库SQL Server，具有企业许可授权，权限更为开放，引擎功能更为强大。能完美支持Windows平台的.NET架构，支持复杂SQL查询，性能优秀，并有强大的可视化管理工具，帮助您轻松管理数据。

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