9.4 Object-Relational Databases
Given the wide-spread use of relational database management systems on the one hand and the predominance of object-oriented programming languages on the other hand, most RDBMSs now include some object-oriented functionality. At the heart of this, the SQL standard also includes some object-oriented extensions; the basic unit of storage however is still a tuple inside a relation. RDBMSs supporting (part of) the object-oriented extensions of the SQL standard have been termed object-relational database management systems (ORDBMSs). Note however that (equivalent to the purely relational SQL standard) no ORDBMS implements this standard to its full extent. We now briefly discuss some of these SQL extensions. The presented ...
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