Comparing and Contrasting the Relational Database Model and OO Model The relational database model is based upon tables or relations. In this model‚ the physical implementation of the database is abstracted away from the user. Users query the database using a high-level query language‚ such as SQL. The relations are made up of columns‚ which have headings indicating the attribute represented by that column. Tables have key fields‚ which can be used to identify unique records. Keys relate tables
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Database management systems A database management system (DBMS) consists of software that operates databases‚ providing storage‚ access‚ security‚ backup and other facilities. Database management systems can be categorized according to the database model that they support‚ such as relational or XML‚ the type(s) of computer they support‚ such as a server cluster or a mobile phone‚ the query language(s) that access the database‚ such as SQL or XQuery‚ performance trade-offs‚ such as maximum scale
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History of Relational Database Hao-Wei He Wilmington University October 9‚ 2010 Abstract Database system have been inseparable with our daily life‚ since IBM developed the hierarchical database management system in 1969‚ database system has been innovated many times‚ such as hierarchical database‚ network database‚ relational database‚ and object-oriented database. Nowadays‚ relational database still is the most popular model used by different industries; this article is going to introduce
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Fundamentals of Relational Database Design By Paul Litwin This paper was part of a presentation at a Microsoft TechEd conference in the mid-1990s. It was adapted from Microsoft Access 2 Developer’s Handbook‚ Sybex 1994‚ by Ken Getz‚ Paul Litwin and Greg Reddick. Reprinted with permission of the publisher. While the paper uses Microsoft Access (version 2) for the examples‚ the vast majority of the discussion applies to any database and holds up pretty well over 11 years after it was written. Overview
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Files and Relational Databases What is a file? • contains groups of records used to provide information for operations‚ planning‚ management and decision making. • can be used for storing data for an indefinite period of time‚ or they can be used to store data temporarily for a specific purpose. FILE TYPES • Master Files -- contain records for a group of entities. The attributes may be updated often‚ but the records themselves are relatively permanent. These files
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DBM405 (Database Management System) Facilitator Anup Majumder-University of Phoenix Online Abstract The research that I have done for this individual assignment where I need to provide a brief explanation of OLAP‚ Data Warehouse and Data Mart‚ Three-tier architecture and ASP was through a research online. I found that most of these acronyms for computer terminology are hard to find when the meanings that apply to your subject or acronym you are un-aware of it. In conclusion all the above
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Lesson 1 What is a database: A database is a group of data that has been organised in a table or group. This makes it easy to find data‚ but also allows you to not have any duplicates in a group. A database is used in a school or college to store students date of births. This allows the school to be able to see how old the students are. The database can also be password protected to keep the data safe. What is a flat file database: A flat database is where you have all your data in one table.
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I. Column Oriented Database A column-oriented DBMS is a database management system (DBMS) that stores data tables as sections of columns of data rather than as rows of data. In comparison‚ most relational DBMSs store data in rows. This column-oriented DBMS has advantages for data warehouses‚ customer relationship management (CRM) systems‚ and library card catalogs‚ and other ad hoc inquiry systems where aggregates are computed over large numbers of similar data items. It is possible to achieve
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Database Management Systems I work part time in a marketing research organization‚ which deals with research in the pharmaceutical industry. The total function of this department is to bring out a market research report‚ every month. This report is circulated to the pharmaceutical companies‚ and contains information on the sales of various drugs in the categorized geographical areas of the nation. An important stage in preparation of this report is giving a numeric code to the drugs prescribed
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Research Assignment While the database management system terminology has become widespread in India‚ there is a vast space for the adoption of the systems. The market potential still has a significant amount of spread to increase market share. A computer database is a repository of structured data or information and a database management system is a collection of programs that allows storage and retrieval of this data efficiently. Database management systems have undergone significant changes over
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