A Heterogeneous database system is an automated (or semi-automated) system for the integration of heterogeneous, disparate database management systems to present a user with a single, unified query interface.
Heterogeneous database systems (HDBs) are computational models and software implementations that provide heterogeneous database integration.
Read more about Heterogeneous Database System: Problems of Heterogeneous Database Integration
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“Nothing is so well calculated to produce a death-like torpor in the country as an extended system of taxation and a great national debt.”
—William Cobbett (1762–1835)