This is a comparison of object–relational database management systems (ORDBMSs).
Each system has at least some features of an object–relational database; they vary widely in their completeness and the approaches taken.
Unless otherwise specified in footnotes, comparisons are based on the stable versions without any add-ons, extensions or external programs.
Information about what fundamental ORDBMSes features are implemented natively.
Information about what data types are implemented natively.