<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (October 2008) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (October 2008) (Learn how and when to remove this template message) </Td> </Tr> <P> An object - relational database (ORD), or object - relational database management system (ORDBMS), is a database management system (DBMS) similar to a relational database, but with an object - oriented database model: objects, classes and inheritance are directly supported in database schemas and in the query language . In addition, just as with pure relational systems, it supports extension of the data model with custom data - types and methods . </P> <P> An object - relational database can be said to provide a middle ground between relational databases and object - oriented databases (object database). In object - relational databases, the approach is essentially that of relational databases: the data resides in the database and is manipulated collectively with queries in a query language; at the other extreme are OODBMSes in which the database is essentially a persistent object store for software written in an object - oriented programming language, with a programming API for storing and retrieving objects, and little or no specific support for querying . </P>

Difference between relational database and object relational database
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