maxcompute用户指南SQL 的相关内容

阿里云文档 2025-05-14

MaxCompute SQL节点

DataWorks提供的MaxCompute SQL节点，可用于周期性调度MaxCompute的SQL任务，并支持与其他类型节点集成以及联合调度。MaxCompute SQL任务采用类似SQL的语法，适用于海量数据（TB级）但实时性要求不高的分布式处理场景。本文为您介绍在DataWorks上开发MaxCompute SQL节点任务。

阿里云文档 2024-12-05

SQL File使用说明

DSW提供了SQL File插件功能，支持您通过SQL语句的方式，对具有查询权限的MaxCompute数据源进行快速的数据查询。

阿里云文档 2024-11-28

在离线计算引擎MaxCompute下如何创建MAX_COMPUTE_SQL任务

本文为您介绍在离线计算引擎MaxCompute下如何创建MAX_COMPUTE_SQL任务。

阿里云文档 2024-11-15

SQL注释

为了增强代码的可读性，您可以在MaxCompute SQL代码中增加注释。本文为您介绍MaxCompute SQL单行注释与多行注释的使用说明。

阿里云文档 2024-10-09

在离线计算引擎MaxCompute下如何创建MAX_COMPUTE_SQL任务

本文为您介绍在离线计算引擎MaxCompute下如何创建MAX_COMPUTE_SQL任务。

问答 2017-10-23 来自：开发者社区

MaxCompute用户指南：SQL：附录：与Hive数据类型映射表

MaxCompute 与 Hive 的数据类型映射表，如下所示： Hive 数据类型MaxCompute 数据类型BOOLEANBOOLEANTINYINTBIGINTSMALLINTBIGINTINTBIGINTBIGINTBIGINTFLOATDOUBLEDOUBLEDOUBLEDEICIMALDEICIMALSTRINGSTRINGVARCHARSTRINGCHARSTRINGBINARY....

问答 2017-10-23 来自：开发者社区

MaxCompute用户指南：SQL：附录：正则表达式规范

MaxCompute SQL 中的正则表达式采用的是 PCRE 的规范，匹配时是按字符进行，支持的元字符如下所示：元字符说明^行首$行尾.任意字符*匹配零次或多次+匹配1次或多次?匹配零次或1次?匹配修饰符，当该字符紧跟在任何一个其他限制符 (* ,+, ?, {n}, {n,}, {n,m})后面时，匹配模式是非贪婪的。非贪婪模式尽可能少的匹配所搜索的字符串，而默认的贪婪模式则尽可能多的匹....

问答 2017-10-23 来自：开发者社区

MaxCompute用户指南：SQL：附录：LIKE字符匹配

在 LIKE 匹配时，%表示匹配任意多个字符，\_表示匹配单个字符，如果要匹配%或\_本身，则要对其进行转义，\\%匹配字符%， \\\_匹配字符\_。     'abcd' like 'ab%' -- true    'abcd' like 'ab\%' -- false   &nbsp...

问答 2017-10-23 来自：开发者社区

MaxCompute用户指南：SQL：附录：转义字符

在 MaxCompute SQL 中的字符串常量可以用单引号或双引号表示，可以在单引号括起的字符串中包含双引号，或在双引号括起的字符串中包含单引号，否则要用转义符来表达。如下表达方式均可： "I'm a happy manong."'I\'m a happy manong.' 在 MaxCompute SQL 中，反斜线“\”是转义符，用来表达字符串中的特殊字符，或将其后跟的字符解释为其本身。....

问答 2017-10-23 来自：开发者社区

MaxCompute用户指南：SQL：UDF：Java UDF

MaxCompute 的 UDF 包括：UDF，UDAF 和 UDTF 三种函数，本文将重点介绍如何通过 Java 实现这三种函数。参数与返回值类型 MaxCompute2.0 版本升级后，Java UDF 支持的数据类型从原来的 Bigint，String，Double，Boolean 扩展了更多基本的数据类型，同时还扩展支持了 ARRAY，MAP，STRUCT 等复杂类型。 Jav...

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