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Computer database in which all data is stored in Relations which (to the user) are tables with rows and columns. Each table is composed of records (called Tuples) and each record is identified by a field (attribute) containing a unique value. Each and every table shares at least one field with another table in 'one to one,' 'one to many,' or 'many to many' relationships mode . These relationships allow the database user to access the data in almost an unlimited number of ways, and to create complex and very large databases to combine the tables as building blocks . RDBMSs have been the leading data management software used in industry. The relational model de?ned by Codd in 1970 is the basis of a RDBMS. The relational model logically stores data in relations, also referred to as tables. A relation is structured with attributes (columns) and tuples (rows) of data. User can easily understand this logical representation since it can be mapped to something that is known in the real world. For example, mathematicians and o?ce workers stored information in tables (columns and rows),long before computers
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