What was the method in which records are physically stored, Database Management System

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What was the method in which records are physically stored in a specified order according to a key field in each record ?

A method in which records are physically stored within a specified order according to a key field in every record is hash. (In hash method, a hash function is performed on the key value to determine the unique physical address of the record to store or retrieve)

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ERD, entity relationship diagram about finance

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Er diagram, er diagtram for icici

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