Guide to SQL Standard, A by C. J. Date

By C. J. Date

An instructional consultant and a reference that describes the respectable common model of the database language SQL. The 5 significant components comprise creation, a few preliminaries, facts definition and manipulation, info keep watch over and complex themes. Paper. DLC: SQL (Computer application language)

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Operational Data Decision Support Data Application-oriented: data serves a particular business process or functionality. For example a fully normalized banking system with separate tables for each business process. Subject-oriented: data serves a certain subject of the business, such as customer account, customer information, etc. De-normalized data where one record may cover the whole business process. Detailed data where, for example, you could see every bank transaction carried out. Summarized or refined data with complex calculations at times.

It is the ability to conduct complex calculations by the OLAP applications that allows successful transfer of the raw data to information, and later to knowledge. Time Intelligence Time is a universal dimension for almost all OLAP applications. It is very difficult to find a business model where time is not considered an integral part. Time is used to compare and judge performance of a business process. As an example, performance of the eastern region this month may be compared to its performance last month.

If the data is not valid, the integrity of any business analysis based on it will be in question. For example, in the case of a currency field, where the OLAP system may exist in different countries, one has to make sure that the data in this currency field is always converted appropriately according to the currency of the destination data warehouse. A further point you need to pay close attention to when validating the data is information related to geographical regions. You need to make sure that the referenced cities are in the right countries as the country field states.

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