G PHYSICS
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G06 COMPUTING OR CALCULATING; COUNTING
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G06F ELECTRIC DIGITAL DATA PROCESSING
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G06F16/00 Information retrieval; Database structures therefor; File system structures therefor
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G06F16/20 of structured data, e.g. relational data
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G06F16/28 Databases characterised by their database models, e.g. relational or object models
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G06F16/284 Relational databases
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