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概要
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Yellowfinのビューは、データソース内の物理的なビューあるいはテーブルのメタデータです。レポート作成者は、データベースに対してクエリーを発行するビューを選ぶだけで、データベースの実際の構造について理解することなしに、データの分析やビューのフィールドを使ってのレポート作成を行うことができます。
ビューは、レポート作成者が技術的なスキルなしにレポートの実行やデータの分析を行えるよう、直観的なインターフェースを提供します。
See [View Creation] for more information.
ビューの管理
ビューは管理者によって作成されます。どんな人がビュー管理者になるかについて基準はありません。たとえば社内のデータベース管理者やアプリケーションマネージャー、あるいはプロジェクトマネージャーなど、あるいは十分な技術力のあるビジネスユーザーが他のユーザーのためにビューを作成することになるでしょう。
ビュー管理者には、以下のような技術的なスキルと知識が必要です：
スキルと知識 | 説明 |
ユーザーのニーズを分析する能力 | ビュー管理者には、ユーザーのニーズを分析して解りやすいカテゴリーやフィールドを定義し、ユーザーコミュニティの要件を満たすようなビューを作成できる能力が必要です。 |
データベースの知識 | ビュー管理者は会社のデータベース管理システム（DBMS）に関する実用的知識が必要です。データベースの運用状況やその論理的構造、そしてデータベースに収められているデータに関して熟知していなければなりません。 |
SQL（Structured Query Language） | SQLの実用的知識が必要です。 |
What does a view contain?
A view contains the following structures:
Categories | The purpose of categories is to provide logical groupings of fields within a view. The name of a category should intuitive to the business user and provide an indication of the fields that it is likely to contain. |
Fields | A field is a named component that maps to data or a derivation of data in the database. The name of a field should be drawn from the business vocabulary of the targeted user group. |
Field Types
When creating a VIEW, you define and categorise fields. The definition of a field reveals how it can be used in analysis and reports. A field can be defined as a dimension or a metric. Each type of field serves a different purpose:
| Dimension fields retrieve the data that will provide the basis for analysis in a report. Dimensions typically retrieve character-type data (employee names, company names, etc.), or dates (years, quarters, etc.) |
| Metric fields retrieve numeric data that is the result of calculations on data in the database. |
| Pre-Defined Filters are fields where a set of conditions have been set up when the view was created. This assists users to limit the data returned in a query to only the expected results. For example if the filter is called 'United States' then only data from the united states would be included in the results. |
| Parameters are fields which are used to capture user defined values and pass them into calculated fields or filters. These parameters can assist in conducting what if analysis. |
| View Filter Groups are sets fields to be used as filters, reused multiple times. Filter Groups can contain filter dependency hierarchies, as well as cached values. These only have to be set up once, rather than for each report. |
How are views used?
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Views are used by Yellowfin report writers. The view meta-data is stored within the Centralised Yellowfin repository. An end user connects to a view via a web browser when running a report.
By using a view, the end user automatically has access to data within your source system. Access to data is restricted by the fields that are available in the view. These fields have been created by the administrator based on the report users needs.
Assisting Data Analysis
A view can represent the data needs of any specific application, system, or group of users. For example, a view can contain fields that represent the data needs of the Marketing or Accounting departments in a company.
A view can also represent the data needs of a section within a department or any set of organized procedures such as a payroll or inventory system.
Who uses views?
Yellowfin report writers use views for reporting and analysis. The view should provide them with categories and fields relevant to their business domain.
How are fields presented for report writers?
Fields are displayed as nodes in a folder tree as shown below.
View design methodology
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The view design methodology consists of four stages:
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