前言前几篇我们讲解了ODPS数据开发过程中会大量用到的各种日期与字符、数学运算、聚合、开窗、自定义等函数，今天我们针对海量数据开发过程数据开发效率优化做讲解。常见数据优化问题数据倾斜问题 1、大表关联小表大表关联小表出现倾斜时，可以使用mapjoin的hint(/+mapjoin(b)/)。同时可适当调整mapjoin中小表的内存大小： set odps.sql.mapjoin.mem...

文章 2022-12-17 来自：开发者社区

阿里云-DataWorks- ODPS SQL开发3-日期与字符、数学运算、聚合函数函数

前言本文主要讲解日常大量会接触到的一些常用的日期与字符、数学运算、聚合函数函数一、日期函数GETDATE函数: 获取当前系统时间SELECT GETDATE();执行结果: 2022-12-15 20:33:23DATEADD函数: 日期增减SELECT DATEADD(GETDATE(),1,'dd');执行结果: 2021-06-28 20:34:17SELECT DATEADD(GETDA....

文章 2022-12-17 来自：开发者社区

阿里云-DataWorks- ODPS SQL开发2

前言我们在DataWorks空间下做数据开发时会经常用到大量的函数，本文主要讲解日常大量会接触到的一些。常用函数与关键词：1、coalesce（expr1，expr2）返回列表中第一个非null的值2、concat（string A，string B）将参数中的所有字符串连接在一起如果没有参数或者有某个参数为null就返回null3、cast（expr as ）将表达式的结果...

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