Why object-oriented system use the relational dbms, Database Management System

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Why, generally does an object-oriented system use the relational DBMS?

The reasons for using relational DBMS for OO systems could be any combination of following:

a. Many organizations have existing relational databases including existing business data.

b. Most commercial RDBMS come with "Object-Relational" extension which implements object database on top of a RDBMS. 

c. Purely object databases are too complex to use, and lack standards like SQL.

 


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