define data model a data model is a collection
Define data model?
A data model is a collection of conceptual tools for explaning data, data relationships, data semantics and consistency constraints.
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explain the halting problemgiven a computer program and an input to it verify whether the program will halt on that input or continue working
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define instance and schema instance collection of data kept in the data base at a particular moment is
define the terms 1 physical schema 2 logical schema physical schema the physical schema explains the database design at the physical level
define data model a data model is a collection of conceptual tools for explaning data data relationships data semantics and consistency
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what is a data dictionary a data dictionary is a data structure which keeps meta data about the structure of the database ie the schema of the
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