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	1010data OLAP	2000	Relational	Proprietary	OLAP
	4D	1984	Relational	Proprietary
	Access	1992	Relational	Proprietary
	Adabas	1971	Network	Proprietary
	Adaptive Server Enterprise Acquired Company	1987	Relational	Proprietary	Acquired Company
	Advantage Database Server xBase Acquired Company	1993	Relational	Proprietary	xBase Acquired Company
	Aito	2017	—	Proprietary
	Algebraix	2009	—	Proprietary
AL	Allbase/SQL	—	—	Proprietary
	AllegroGraph	2004	Triplestore / RDF	Proprietary
	AlloyDB OLAP Forked Code OLTP	2022	Relational	Proprietary	OLAP Forked Code OLTP
	Altinity Forked Code AI-Assisted Hosting Service	2017	—	Proprietary	Forked Code AI-Assisted Hosting Service
	AncelusDB	1983	Entity-Relationship	Proprietary
	AnzoGraph	2007	Graph	Proprietary
	Apollo xBase	1999	—	Proprietary	xBase
	Approach Acquired Company Abandoned	1991	Relational	Proprietary	Acquired Company Abandoned
	Aster Data OLAP Acquired Company	2005	Relational	Proprietary	OLAP Acquired Company
	AtomicDB Failed Company	2011	Object-Oriented	Proprietary	Failed Company
	Atoti OLAP	2005	Relational	Proprietary	OLAP
	Aurora DSQL Serverless OLTP	2023	Relational	Proprietary	Serverless OLTP
	Axibase Time-Series Failed Company	2004	—	Proprietary	Time-Series Failed Company
	Azure HorizonDB Forked Code	2026	Relational	Proprietary	Forked Code
	Azure SQL Database Hosting Service	2009	Relational	Proprietary	Hosting Service
	BagelDB	2023	Vector	Proprietary
	Basic	2023	Document / XML	Proprietary
	BASIS	—	Relational	Proprietary
	BigQuery OLAP Serverless	2010	Document / XML	Proprietary	OLAP Serverless
	BitYota Acquired Company	2011	Relational	Proprietary	Acquired Company
	BlazingSQL OLAP Abandoned Failed Company	2015	Relational	Proprietary	OLAP Abandoned Failed Company
	BlobCity Failed Company	2015	Document / XML, Relational	Proprietary	Failed Company
	Brytlyt OLAP Forked Code Acquired Company	2013	Relational	Proprietary	OLAP Forked Code Acquired Company
BU	Bubba Abandoned	1988	Object-Oriented	Proprietary	Abandoned
	Caché	1997	Array / Matrix	Proprietary
	CapyDB Nearest Neighbor Search	2024	Document / XML	Proprietary	Nearest Neighbor Search
	Cedalio Blockchain	2022	Document / XML	Proprietary	Blockchain
	CedarDB OLAP Forked Code OLTP	2023	Relational, Array / Matrix	Proprietary	OLAP Forked Code OLTP
	CheetahDB	2018	Relational	Proprietary
	ClearDB Acquired Company	2010	Relational	Proprietary	Acquired Company
	ClickHouse Cloud Hosting Service	2022	—	Proprietary	Hosting Service
	Cloud Datastore NoSQL	2013	Document / XML	Proprietary	NoSQL
	Cloud Firestore Serverless	2017	Document / XML	Proprietary	Serverless
	Cloud Memorystore Cache Hosting Service	—	—	Proprietary	Cache Hosting Service
CL	CloudSearch Search Engine	2012	Document / XML	Proprietary	Search Engine
	Cloud Spanner NewSQL	2007	—	Proprietary	NewSQL
	Cloud SQL Hosting Service	2012	Relational	Proprietary	Hosting Service
	Clusterpoint Failed Company NoSQL	2006	Document / XML	Proprietary	Failed Company NoSQL
	Clustrix NewSQL Acquired Company OLTP	2006	Relational	Proprietary	NewSQL Acquired Company OLTP
	CompleteDB Abandoned OLTP	2012	Relational	Proprietary	Abandoned OLTP
	CornerStone Acquired Company	1985	Relational	Proprietary	Acquired Company
	CortexDB Multi-Model NoSQL	2014	Document / XML, Key/Value	Proprietary	Multi-Model NoSQL
	Cosmos DB	2015	Key/Value, Graph, Column Family / Wide-Column	Proprietary
CQ	CQL++ Failed Company	1994	Relational	Proprietary	Failed Company
	CrossDB	2019	Relational	Proprietary
	CSV Comp DB	2007	Relational	Proprietary
	cubeSQL Acquired Company	2003	Relational	Proprietary	Acquired Company
	Cubrick	2016	Column Family / Wide-Column	Proprietary
	dashDB Hosting Service	2014	—	Proprietary	Hosting Service
DA	DataBlitz OLTP	1993	Relational	Proprietary	OLTP
	DataEase Acquired Company OLTP	1981	Relational	Proprietary	Acquired Company OLTP
	DATAllegro OLAP Acquired Company	2003	Relational	Proprietary	OLAP Acquired Company
	DataStax	2010	—	Proprietary
	Dataupia Failed Company	2005	Relational	Proprietary	Failed Company
	Datomic Acquired Company	2012	Key/Value	Proprietary	Acquired Company
	Db2	1983	Document / XML, Relational	Proprietary
	DB4IoT	2016	Document / XML	Proprietary
	db4o Acquired Company Abandoned	2000	Object-Oriented	Proprietary	Acquired Company Abandoned
	DB9 Serverless OLTP	2026	Relational	Proprietary	Serverless OLTP
	dBASE xBase	1979	Relational	Proprietary	xBase
DB	DBMS-20	—	Network	Proprietary
DB	DBOMP	1968	Hierarchical	Proprietary
	DeepDB Abandoned Failed Company	2010	Relational	Proprietary	Abandoned Failed Company
	DeviceSQL Streaming	1998	Relational	Proprietary	Streaming
	DittoBitto	2001	Relational	Proprietary
	DMSII	1972	Network	Proprietary
	Dnaerys	—	—	Proprietary
	DocumentDB	2019	Document / XML	Proprietary
	DolphinDB Time-Series	2018	Relational	Proprietary	Time-Series
	Dydra	2010	Triplestore / RDF	Proprietary
	DynamoDB OLTP NoSQL	2012	Document / XML, Key/Value	Proprietary	OLTP NoSQL
	EasyDB Failed Company	2019	Document / XML	Proprietary	Failed Company
	EcoDB Failed Company	2018	Document / XML	Proprietary	Failed Company
	ekoDB	2024	Document / XML	Proprietary
	ElevateDB	2006	Relational	Proprietary
	Eloquera	2008	Object-Oriented	Proprietary
	Empress	1979	Relational	Proprietary
	Endeca OLAP Acquired Company	1999	Document / XML	Proprietary	OLAP Acquired Company
	EraDB Acquired Company	2019	Document / XML	Proprietary	Acquired Company
	Essbase OLAP Acquired Company	1992	Array / Matrix	Proprietary	OLAP Acquired Company
	Essentia Failed Company	—	Object-Oriented, Relational	Proprietary	Failed Company
	EventSourcingDB Time-Series Immutable	2022	Document / XML	Proprietary	Time-Series Immutable
	Exasol	2000	Relational	Proprietary
	Exorbyte	2000	—	Proprietary
	Express Acquired Company	1970	Array / Matrix	Proprietary	Acquired Company
	eXtremeDB Cache Time-Series OLTP Middleware	2001	Column Family / Wide-Column, Entity-Relationship, Key/Value, Relational	Proprietary	Cache Time-Series OLTP Middleware
	FairCom DB	1984	—	Proprietary
	FastObjects Acquired Company	1993	Object-Oriented	Proprietary	Acquired Company
	FatDB Cache Failed Company NoSQL	2012	Key/Value	Proprietary	Cache Failed Company NoSQL
	FaunaDB Serverless Failed Company	2012	Document / XML, Graph, Key/Value, Relational	Proprietary	Serverless Failed Company
	FileMaker Acquired Company	1985	Relational	Proprietary	Acquired Company
	FinchDB	2015	Document / XML	Proprietary
	Firebase Acquired Company NoSQL	2011	Document / XML	Proprietary	Acquired Company NoSQL
	Firebolt OLAP Forked Code	2020	Relational	Proprietary	OLAP Forked Code
	FirstSQL/J Failed Company	2001	Relational	Proprietary	Failed Company
	Floe OLAP Forked Code Data Lake	2025	Relational	Proprietary	OLAP Forked Code Data Lake
	FoxPro xBase	1984	Relational	Proprietary	xBase
	FrontBase	1993	Relational	Proprietary
	FusionDB Abandoned	2019	Document / XML	Proprietary	Abandoned
	Galaxybase	2013	Graph	Proprietary
	GaussDB	2011	Relational	Proprietary
	GBase	2010	—	Proprietary
	GemStone/S	1986	Object-Oriented	Proprietary
	Genesis DB Streaming	2025	Document / XML	Proprietary	Streaming
	GenieDB Failed Company Hosting Service	2008	Relational	Proprietary	Failed Company Hosting Service
	GenosDB AI-Assisted	2025	—	Proprietary	AI-Assisted
	GeoSpock DB Failed Company	2013	Relational	Proprietary	Failed Company
	GlobalsDB	2011	Array / Matrix	Proprietary
	Goldilocks	2010	Relational	Proprietary
	GraphBase	—	Graph	Proprietary
	GraphDB	2000	Triplestore / RDF	Proprietary
	GrapheneDB Hosting Service	2012	Graph	Proprietary	Hosting Service
	Greenplum OLAP Forked Code Acquired Company	2003	Relational	Proprietary	OLAP Forked Code Acquired Company
	GT.M	1986	Key/Value	Proprietary
	Hadapt OLAP Acquired Company Middleware	2009	Relational	Proprietary	OLAP Acquired Company Middleware
	HANA	2010	Column Family / Wide-Column	Proprietary
	HarperDB Serverless NoSQL	2017	Document / XML	Proprietary	Serverless NoSQL
	Hekaton OLTP	2012	Relational	Proprietary	OLTP
	Helium Failed Company	2017	Key/Value	Proprietary	Failed Company
	HexaDB	2023	Relational	Proprietary
	HFSQL	—	—	Proprietary
	HighContext Serverless	2023	Key/Value	Proprietary	Serverless
	HiRDB	1994	Document / XML, Relational	Proprietary
HO	HorizonDB Geospatial	2025	Document / XML	Proprietary	Geospatial
	hss.db	2009	Relational	Proprietary
	Husky Time-Series	2020	Document / XML	Proprietary	Time-Series
	HyPer OLAP Acquired Company OLTP	2010	Relational	Proprietary	OLAP Acquired Company OLTP
	iBoxDB Serverless Mobile NoSQL	2014	Document / XML	Proprietary	Serverless Mobile NoSQL
	IDMS	1973	Network	Proprietary
	Illustra Acquired Company OLTP	1992	Relational	Proprietary	Acquired Company OLTP
	IMS OLTP	1966	Hierarchical	Proprietary	OLTP
	Indica	2014	—	Proprietary
	InfiniteGraph	2010	Graph	Proprietary
	InfinityDB	2002	Key/Value, Graph, Array / Matrix, Hierarchical, Relational	Proprietary
	Infobright OLAP Acquired Company	2005	Relational	Proprietary	OLAP Acquired Company
	InfoFrame Abandoned	2013	Relational	Proprietary	Abandoned
	Informix Acquired Company	1980	Relational	Proprietary	Acquired Company
	Ingres Acquired Company	1974	Relational	Proprietary	Acquired Company
	InstantDB Failed Company	1997	Relational	Proprietary	Failed Company
	InterBase Versioning Acquired Company	1984	Relational	Proprietary	Versioning Acquired Company
	IQ Acquired Company	1992	Relational	Proprietary	Acquired Company
	IQrypt Failed Company	2015	Document / XML	Proprietary	Failed Company
	ITTIA DB Time-Series OLTP	2000	Relational	Proprietary	Time-Series OLTP
	jBASE Acquired Company	1989	Multi-Value	Proprietary	Acquired Company
	JoinBase Time-Series Abandoned	—	Relational	Proprietary	Time-Series Abandoned
	JSONBin.io	2017	Document / XML	Proprietary
	Just Logic/SQL	1994	Relational	Proprietary
	Kappa Abandoned	1989	Relational	Proprietary	Abandoned
	Kdb+ Acquired Company	1998	Relational	Proprietary	Acquired Company
	Kinetica OLAP	2009	Relational	Proprietary	OLAP
	Kingbase	1999	—	Proprietary
	KitaroDB	2012	Key/Value	Proprietary
	Kognitio	—	—	Proprietary
	Kubl Acquired Company	1994	Relational	Proprietary	Acquired Company
	KVdb NoSQL	2018	Key/Value	Proprietary	NoSQL
	LazyDB	2020	Document / XML	Proprietary
	LeanXcale OLAP OLTP	2010	Relational	Proprietary	OLAP OLTP
	Linter	1990	Relational	Proprietary
	LogicBlox Acquired Company	—	—	Proprietary	Acquired Company
	Machbase Time-Series	2017	Relational	Proprietary	Time-Series
	MammothDB OLAP Acquired Company	2012	Relational	Proprietary	OLAP Acquired Company
	MapR-DB Acquired Company	2012	Column Family / Wide-Column	Proprietary	Acquired Company
	MarkLogic Acquired Company	2001	Document / XML, Triplestore / RDF	Proprietary	Acquired Company
	Matisse	1986	Document / XML	Proprietary
	MaxDB OLTP	1977	Relational	Proprietary	OLTP
MO	Model 204 Acquired Company	1965	Entity-Attribute-Value	Proprietary	Acquired Company
	Mongrel Serverless Failed Company	2021	Key/Value	Proprietary	Serverless Failed Company
	MonographDB	2021	Relational	Proprietary
	MotherDuck Hosting Service	2022	Relational	Proprietary	Hosting Service
	mSQL	1994	Relational	Proprietary
MU	Mussel NewSQL	2022	Key/Value	Proprietary	NewSQL
	mvBase Acquired Company	—	Multi-Value	Proprietary	Acquired Company
	Napa	2018	Relational	Proprietary
	NavDB Abandoned	2017	Key/Value, Relational	Proprietary	Abandoned
	NCache Cache	2015	Key/Value	Proprietary	Cache
NE	Neoview Abandoned	2007	Relational	Proprietary	Abandoned
	Neptune	2018	Graph, Triplestore / RDF	Proprietary
	Netezza OLAP Acquired Company	1999	Relational	Proprietary	OLAP Acquired Company
	Netlify Database Serverless Hosting Service	2024	Relational	Proprietary	Serverless Hosting Service
	NeuroDB	2020	Graph	Proprietary
	NexusDB	2003	Relational	Proprietary
	Nile OLTP	2022	Relational	Proprietary	OLTP
	Ninja Database	—	Object-Oriented, Relational	Proprietary
	NonStop SQL Acquired Company OLTP	1987	Relational	Proprietary	Acquired Company OLTP
	NoSQL Object Database Acquired Company NoSQL	1988	Object-Oriented	Proprietary	Acquired Company NoSQL
	NuoDB NewSQL Acquired Company	2010	Relational	Proprietary	NewSQL Acquired Company
	ObjectDatabase++	2003	Object-Oriented	Proprietary
	ObjectDB	2010	Object-Oriented	Proprietary
	Objectivity/DB	1990	Object-Oriented	Proprietary
	ObjectStore Acquired Company	1988	Object-Oriented	Proprietary	Acquired Company
	ObsessionDB OLAP Hosting Service	2024	Relational	Proprietary	OLAP Hosting Service
	Ocient	2016	Relational	Proprietary
	OnceDB Cache Abandoned Failed Company	2016	Document / XML	Proprietary	Cache Abandoned Failed Company
	OneDB	2020	Relational	Proprietary
	OpenBase SQL Failed Company	1991	Relational	Proprietary	Failed Company
	OpenEdge OLTP	1984	Relational	Proprietary	OLTP
	OpenQM Acquired Company	1993	Multi-Value	Proprietary	Acquired Company
	Oracle NoSQL NoSQL	2011	Key/Value	Proprietary	NoSQL
	Oracle RDBMS	1977	Key/Value, Graph, Triplestore / RDF, Document / XML, Relational	Proprietary
	Oxla OLAP Acquired Company	2020	Relational	Proprietary	OLAP Acquired Company
	PancakeDB	2021	—	Proprietary
	ParAccel OLAP Acquired Company	2006	Relational	Proprietary	OLAP Acquired Company
	Paradox Acquired Company Abandoned	1985	Relational	Proprietary	Acquired Company Abandoned
	ParStream OLAP Acquired Company Abandoned	2010	Relational	Proprietary	OLAP Acquired Company Abandoned
	Perst Acquired Company	2003	Object-Oriented	Proprietary	Acquired Company
PE	Peterlee Relational Test Vehicle	1970	Relational	Proprietary
	PieCloudDB OLAP	2021	Relational	Proprietary	OLAP
	Pinecone Nearest Neighbor Search Search Engine	2019	Vector	Proprietary	Nearest Neighbor Search Search Engine
	PlanetScale Forked Code OLTP	2018	Relational	Proprietary	Forked Code OLTP
PN	PNUTS Abandoned OLTP NoSQL	2008	Key/Value	Proprietary	Abandoned OLTP NoSQL
	PointBase Acquired Company	1998	Relational	Proprietary	Acquired Company
	PolarDB	2017	Relational	Proprietary
	Polybase Blockchain	2022	Document / XML	Proprietary	Blockchain
	Polyhedra Acquired Company	1994	Relational	Proprietary	Acquired Company
	PrimeBase OLTP	1990	Relational	Proprietary	OLTP
	Proteus	2015	Relational	Proprietary
	ProtonBase OLAP	2021	Document / XML, Relational	Proprietary	OLAP
	ProvenDB Acquired Company Blockchain Middleware	2018	Document / XML	Proprietary	Acquired Company Blockchain Middleware
	P*TIME Acquired Company OLTP	2000	Relational	Proprietary	Acquired Company OLTP
	PuffinDB Serverless Abandoned	2023	Relational	Proprietary	Serverless Abandoned
	Qizx Acquired Company	2004	Document / XML	Proprietary	Acquired Company
	QLDB Abandoned Blockchain	2018	Document / XML	Proprietary	Abandoned Blockchain
	quasardb	2008	Key/Value	Proprietary
	RainStor Acquired Company	2004	Relational	Proprietary	Acquired Company
	RapidsDB OLAP Middleware	2014	—	Proprietary	OLAP Middleware
	RaptorDB Forked Code	2024	Relational	Proprietary	Forked Code
	R:BASE Acquired Company	1981	Relational	Proprietary	Acquired Company
	/rdb Abandoned	1984	Relational	Proprietary	Abandoned
	Rdb/VMS Acquired Company	1984	Relational	Proprietary	Acquired Company
	RDFox	—	Triplestore / RDF	Proprietary
	Reality Acquired Company	1973	Multi-Value, Relational	Proprietary	Acquired Company
	Red Brick OLAP Acquired Company	1990	Relational	Proprietary	OLAP Acquired Company
	RedDatabase Forked Code	2006	Relational	Proprietary	Forked Code
	Redshift OLAP Serverless	2012	Relational	Proprietary	OLAP Serverless
	Regatta OLAP OLTP	2020	Relational	Proprietary	OLAP OLTP
	RelationalAI	2018	Graph, Relational	Proprietary
	Relational Database Service Hosting Service	2009	—	Proprietary	Hosting Service
	Resin Cache Cache Middleware	1998	Key/Value	Proprietary	Cache Middleware
	Rockall-DB	—	—	Proprietary
	Rockset OLAP Acquired Company	2016	Relational	Proprietary	OLAP Acquired Company
	Rosebase Failed Company	1992	Relational	Proprietary	Failed Company
	RudraDB Nearest Neighbor Search	2025	Document / XML, Vector	Proprietary	Nearest Neighbor Search
	Sadas Engine OLAP	—	Relational	Proprietary	OLAP
	ScaleDB Failed Company	2005	—	Proprietary	Failed Company
	ScaleOut StateServer	2005	Key/Value	Proprietary
	SchoonerSQL Acquired Company OLTP	2007	Relational	Proprietary	Acquired Company OLTP
	SciDB OLAP	2008	Array / Matrix	Proprietary	OLAP
	ScimoreDB	2005	Relational	Proprietary
	ScopeDB	2024	Relational	Proprietary
	Scuba	2013	Relational	Proprietary
	SearchBlox Search Engine	2003	Document / XML	Proprietary	Search Engine
	ShareBase Acquired Company	1979	Relational	Proprietary	Acquired Company
	SimpleDB NoSQL	2007	Key/Value	Proprietary	NoSQL
	SingleStore OLAP NewSQL Acquired Company OLTP	2011	Document / XML, Key/Value, Multi-Value, Object-Oriented, Relational, Vector	Proprietary	OLAP NewSQL Acquired Company OLTP
	SlicingDice Failed Company	2015	—	Proprietary	Failed Company
	SlyceIO	2023	Document / XML	Proprietary
SM	SmithDB OLAP	2026	—	Proprietary	OLAP
	Snowflake OLAP	2013	Document / XML, Relational	Proprietary	OLAP
	solidDB Acquired Company OLTP	1992	Relational	Proprietary	Acquired Company OLTP
	SpaceTime	2020	Relational	Proprietary
	SparkleDB OLTP	2013	Graph	Proprietary	OLTP
	Speedb Forked Code Acquired Company	2020	Key/Value	Proprietary	Forked Code Acquired Company
	Sphinx Search Engine	2001	Document / XML	Proprietary	Search Engine
	Splunk Acquired Company Search Engine	2002	Key/Value	Proprietary	Acquired Company Search Engine
	SpreadsheetDB Failed Company	2017	Document / XML	Proprietary	Failed Company
	SQL Anywhere Acquired Company	1992	Relational	Proprietary	Acquired Company
	SQLBase Acquired Company	1984	Relational	Proprietary	Acquired Company
SQ	SQL/DS	1981	Relational	Proprietary
	SQLflex	—	Relational	Proprietary
	SQLite.Cloud OLTP Hosting Service	2020	Relational	Proprietary	OLTP Hosting Service
	SQL Server	1988	Relational	Proprietary
	SQream OLAP	2010	Relational	Proprietary	OLAP
	SRCH² Abandoned	2010	—	Proprietary	Abandoned
	Starcounter	2006	—	Proprietary
	Stardog	2005	Triplestore / RDF	Proprietary
	Streambase Acquired Company Streaming	2003	Relational	Proprietary	Acquired Company Streaming
	StrixDB	—	Triplestore / RDF	Proprietary
	Superbase	1983	Relational	Proprietary
	Supra Server SQL Acquired Company OLTP	1989	Relational	Proprietary	Acquired Company OLTP
	Swarm64 OLAP Acquired Company	2013	Relational	Proprietary	OLAP Acquired Company
	SWC-DB Abandoned	2019	Column Family / Wide-Column, Key/Value	Proprietary	Abandoned
	SynapCores	2026	—	Proprietary
SY	System R OLTP	1972	Relational	Proprietary	OLTP
	Tablespace	2024	—	Proprietary
	Tanzu GemFire Cache Acquired Company NoSQL	2002	Key/Value	Proprietary	Cache Acquired Company NoSQL
	TayzGrid	—	Object-Oriented	Proprietary
	Tdbengine	1985	Relational	Proprietary
	Teradata	1979	Document / XML, Graph, Relational	Proprietary
	Tesora Acquired Company Middleware	2010	Relational	Proprietary	Acquired Company Middleware
	Theseus OLAP Failed Company	2022	Relational	Proprietary	OLAP Failed Company
	Tibero OLTP	2003	Relational	Proprietary	OLTP
	TigerGraph	2012	Graph	Proprietary
	TimesTen Acquired Company OLTP	1996	Relational	Proprietary	Acquired Company OLTP
	Timestream	2018	Relational	Proprietary
	Tinybird	2019	—	Proprietary
	TonicDB OLTP	2025	Key/Value	Proprietary	OLTP
	TopK Nearest Neighbor Search Search Engine AI-Assisted	2024	Document / XML	Proprietary	Nearest Neighbor Search Search Engine AI-Assisted
	Transbase	1987	Relational	Proprietary
	TransLattice NewSQL Failed Company	2007	Relational	Proprietary	NewSQL Failed Company
	Truviso Acquired Company Streaming	2006	Relational	Proprietary	Acquired Company Streaming
	turbopuffer Serverless Nearest Neighbor Search	2023	Vector	Proprietary	Serverless Nearest Neighbor Search
	UDS/SQL	—	Network	Proprietary
	Ultipa OLAP OLTP NoSQL	2019	Graph	Proprietary	OLAP OLTP NoSQL
	Umbra OLAP OLTP	2018	Array / Matrix, Relational	Proprietary	OLAP OLTP
	Unbounded Failed Company	2020	Document / XML	Proprietary	Failed Company
	UniSQL Acquired Company	1991	Relational	Proprietary	Acquired Company
	UnumDB Abandoned Failed Company	2015	Document / XML, Graph, Key/Value, Array / Matrix	Proprietary	Abandoned Failed Company
	Valentina Database OLTP	1998	Relational	Proprietary	OLTP
	Vector OLAP Acquired Company	2009	Relational	Proprietary	OLAP Acquired Company
	Vedis Abandoned	2014	Key/Value	Proprietary	Abandoned
	VelocityDB Abandoned	2011	Object-Oriented	Proprietary	Abandoned
	Vertica OLAP Forked Code Acquired Company	2005	Relational	Proprietary	OLAP Forked Code Acquired Company
	Virtuoso	1998	Relational	Proprietary
	VistaDB	2009	—	Proprietary
	Visual FoxPro xBase	1992	Relational	Proprietary	xBase
	VoltDB NewSQL	2009	Relational	Proprietary	NewSQL
VU	VulcanDB Failed Company	2012	Object-Oriented	Proprietary	Failed Company
XD	XDB Enterprise Server Acquired Company	1998	Relational	Proprietary	Acquired Company
	Xeround Failed Company Hosting Service	2005	Relational	Proprietary	Failed Company Hosting Service
	XtremeData OLAP	2003	Relational	Proprietary	OLAP
	Yaacomo OLAP Failed Company	2008	Relational	Proprietary	OLAP Failed Company
	Yanza Time-Series Failed Company	2008	Document / XML	Proprietary	Time-Series Failed Company
	YARD-SQL Failed Company	1996	Relational	Proprietary	Failed Company
	Yellowbrick OLAP	2014	Relational	Proprietary	OLAP
	zeeSQL Cache OLTP	2021	Relational	Proprietary	Cache OLTP
	ZippyDB Cache Serverless Failed Company	2014	Key/Value	Proprietary	Cache Serverless Failed Company
	ZippyDB	2013	Key/Value	Proprietary