英文:
What's the difference between a DataMart and a Fact Table?
问题
我实际上不太理解"DataMart"的确切含义。
例如，如果我的数据仓库有4个事实表，这是否必然意味着我有4个数据集？
这些是我拥有的人力资源（HR）事实表。
Fact_Employee_Entrance_Exits
Fact_Employee_Leaves
Fact_Employee_Reviews
Fact_Employee_Compensation
对我来说，我认为前三个事实表可以作为一个可以供人力资源部门使用的数据集，而最后一个事实表可以供财务部门使用。
英文:
I actually don't understand the exact meaning of DataMart.
For instance , if my datawarehouse has 4 fact tables , does that necessarily mean I have 4 datamarts?
These are the HR fact tables I have.
Fact_Employee_Entrance_Exits
Fact_Employee_Leaves
Fact_Employee_Reviews
Fact_Employee_Compensation
For me , I think that the first three facts would be a datamart that could be used by the
HR department while the last fact table could be used by the Financial Department.
答案1
得分: 0
数据集市（Data Mart）是数据仓库的一个子集，专注于组织内的特定主题领域或部门。它包含一组事实表、维度表和其他相关数据，专门定制以满足特定业务部门或用户群体的报告和分析需求。
在您的情况下，如果您的数据仓库中有与人力资源相关的四个事实表，分别是 Fact_Employee_Entrance_Exits（员工入职离职事实表）、Fact_Employee_Leaves（员工离职事实表）、Fact_Employee_Reviews（员工评价事实表） 和 Fact_Employee_Compensation（员工薪酬事实表），您确实可以考虑创建不同部门的独立数据集市。
根据您的描述，有一个专注于人力资源的数据集市是有道理的，其中包括前三个事实表（Fact_Employee_Entrance_Exits、Fact_Employee_Leaves 和 Fact_Employee_Reviews）。这个人力资源数据集市将作为人力资源部门的专用报告和分析环境，为他们提供有关员工入职和离职、休假和评价的必要信息。
同样地，Fact_Employee_Compensation 事实表可以成为专门面向财务部门的独立数据集市的一部分。这个财务数据集市将包含与员工薪酬相关的财务分析和报告所需的维度和其他相关数据。
通过创建独立的数据集市，您可以为不同的用户群体或部门提供更专注和定制的数据集，使他们能够更高效地进行分析和报告。这还有助于控制数据访问，并确保每个部门获得与他们具体需求相关的数据。
英文:
A Data Mart is a subset of a data warehouse that is focused on a specific subject area or department within an organization. It contains a collection of fact tables, dimension tables, and other relevant data that is specifically tailored to meet the reporting and analysis needs of a particular business unit or user group.
In your case, if you have four fact tables in your data warehouse related to HR, namely Fact_Employee_Entrance_Exits, Fact_Employee_Leaves, Fact_Employee_Reviews, and Fact_Employee_Compensation, you can indeed consider creating separate Data Marts for different departments.
Based on your description, it makes sense to have one Data Mart focused on HR, which would include the first three fact tables (Fact_Employee_Entrance_Exits, Fact_Employee_Leaves, Fact_Employee_Reviews). This HR Data Mart would serve as a dedicated reporting and analysis environment for the HR department, providing them with the necessary information about employee entrance and exits, leaves, and reviews.
Similarly, the Fact_Employee_Compensation fact table can be part of a separate Data Mart that caters specifically to the Financial Department. This Financial Data Mart would contain the necessary dimensions and other relevant data required for financial analysis and reporting related to employee compensation.
By creating separate Data Marts, you can provide more focused and tailored data sets to different user groups or departments, enabling them to perform their analysis and reporting more efficiently. It also helps in controlling data access and ensuring that each department gets the data relevant to their specific needs.
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