The Object-relational Impedance Mismatch is a set of problems in application development when an object from an object-oriented paradigm is to be saved in a relational databse particularly because objects or class definitions must be mapped to database tables defined by relational schema.
The object-oriented paradigm is based on proven software engineering principles. The relational paradigm, however, is based on proven mathematical principles. Because the underlying paradigms are different the two technologies do not work together seamlessly.
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