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Evolution of DB Systems ï¬ ï¬ ï¬ ï¬ ï¬ ï¬ ï¬ ï¬ Flat files - 1960s - 1980s Hierarchical â 1970s - 1990s Network â 1970s - 1990s Relational â 1980s - present Object-oriented â 1990s - present Object-relational â 1990s - present Data warehousing â 1980s - present Web-enabled â 1990s - present