G PHYSICS
G06 COMPUTING OR CALCULATING; COUNTING
G06F ELECTRIC DIGITAL DATA PROCESSING
16/00 Information retrieval; Database structures therefor; File system structures therefor
G06F16/20 of structured data, e.g. relational data
G06F16/25 Integrating or interfacing systems involving database management systems
G06F16/254 Extract, transform and load [ETL] procedures, e.g. ETL data flows in data warehouses