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Dimension Data was a company specialising in information technology services. Based in Johannesburg, South Africa, [2] the company maintained operations on every inhabited continent. [3] Dimension Data focused on services including IT consulting, technical and support services, and managed services.
A common data warehouse example involves sales as the measure, with customer and product as dimensions. In each sale a customer buys a product. The data can be sliced by removing all customers except for a group under study, and then diced by grouping by product. A dimensional data element is similar to a categorical variable in statistics.
In 1997, Dimension Data acquired Internet Solutions by purchasing the remaining 75% of the company; previously they had acquired 25% the year before. [3] Ronnie Apteker, one of the founders of Internet Solutions stated that one of the main reasons for selling the company was to enhance the company's ability to deliver to the market and has joined forces with Dimension Data to meet market needs.
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The vast amount of personal data for sale online is an “increasingly powerful” tool for intelligence gathering by US and foreign spying agencies but also represents a privacy risk to ordinary ...
For example, each sale is measured by the number of units sold, the unit price, and the total receipts. A dimension is a property, with a finite domain, that describes an analysis coordinate of the fact. A fact generally has multiple dimensions that define its minimum representation granularity.
One good design rule [1] is to never store percentages or ratios in fact tables but only calculate these in the data access tool. Thus only store the numerator and denominator in the fact table, which then can be aggregated and the aggregated stored values can then be used for calculating the ratio or percentage in the data access tool.
Dimensions are the foundation of the fact table, and is where the data for the fact table is collected. Typically dimensions are nouns like date, store, inventory etc. These dimensions are where all the data is stored. For example, the date dimension could contain data such as year, month and weekday. Identify the facts