Relational databases have also added object-oriented features; for example, UniSQL was one of the first products to support both structures. See universal server, ODMG and object-oriented programming.

The data are stored in a traditional relational database or in an object database if the data have a complex structure. See O-R mapping and object database.

Relational calculus. Query processing and optimization. Transaction processing: failure, recovery, and concurrency. Database security. Logic-based systems. Parallel, distributed, and client/server ...

In general, Zicari's study was aimed at exposing the problems with object-oriented systems using relational database technologies.

The purpose of that marriage was for Versant to provide a line of object-oriented databases to power a broader range of applications than either company could accomplish on its own.

Since the introduction of object-oriented programming languages and three-tier architectures, enterprise application designers have tried to hide the relational database structure deep in the ...

The object relational impedance mismatch makes it unnecessarily difficult and time consuming to squeeze an object oriented “round object' into a relational “square table.” ...

Topics covered include relational database model, entity-relationship modeling, normalization, SQL language, data warehousing, data quality and integration, data and database administration, and ...

Unlike some object-oriented and object-relational database systems, db4o does not require you to pass your code through an instrumentation pre- or post-compilation step.