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The concept of data integration is one of the oldest studies which came into being since the conception of database management system. Basically data integration can be defined as the problem of combining of data from heterogeneous sources to one unified structure, so that user is able to view it as a single entity irrespective of the origination or it's data type. In today's highly competitive market scenario every business decision must be made on strong and reliable data foundation. These data must contain historical, current and sometimes even real time values from different & most likely from heterogeneous sources.
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