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前言事实表作为数据仓库维度建模的核心，紧紧围绕着业务过程来设计，通过获取描述业务过程的度量来表达业务过程，包含了引用的维度和与业务过程有关的度量。正文1、三种事实表概述事实表有三种类型 : 事务事实表、周期快照事实表和累积快照事实表。1.1 事务事实表也称原子事实表，描述业务过程，跟踪控件或时间...

一篇文章搞懂数据仓库：维度表（设计原则、设计方法）

正文1、什么是维度表？维度是维度建模的基础和灵魂。在维度建模中，将度量称为“事实” ，将环境描述为“维度”。维度表包含了事实表中指定属性的相关详细信息，最常用的维度表有日期维度、城市维度等。例，小编的日期维表：num字段名字段中文名描述数据类型1date日期日期 yyyMMdd格式bigint2w...

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