Relational Database Management Systems and Geographic Information Systems (GIS)
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Paper Topic: Relational Database Management Systems and Geographic Information Systems (GIS) Relational database management system (RDMS ) and Geographic Information System (GIS Relational database are based on the relational model of data developed by E
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243 The Structured Query Language (SQL ) provides users of relational databases with the facility to define the database scheme , and then insert , modify , and retrieve data from the database (data manipulation The data definition language (DDL ) component of SQL allows the creation , alteration , and deletion of relation schemes
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In this model , the table is the only data structure Tables that have their rows of data stored in the database are called base tables
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6 Oracle 7 relational database management system is a suite of product to support various functions including query processing , online transaction processing , data warehousing , workgroup management , and internet access among others
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The query optimizer for data warehousing is cost based and supports queries such as start queries and snow flakes queries
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44 The database management system is the software and collection of tools that manages the database
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When query is formulated , one can specify whatever one wants the data to be displayed in , regardless of the actual used to store the data in base tables (Halpin , 2001
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Although of rows and columns is irrelevant at the logical level , at the physical level , the does exist and needs to be taken into account while tuning the database for efficient access The result of queries is also tables , but these are unnamed and may contain duplicate rows
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Normally a relation scheme is altered only rarely once the database is operational A relation schemes provide a set of attributes , each with an associated data domain , with additional properties relating to the keys and integrity constraints
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A relational database management system is a DMBS that is relational in nature
