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	1010data OLAP	2000	Relational	—	Custom API, HTTP / REST, SQL	—	OLAP
	4D	1984	Relational	Supported	Custom API, SQL	Supported
	Access	1992	Relational	Supported	Custom API	Supported
	ActorDB Abandoned	2014	Relational	Supported	Custom API, SQL	—	Abandoned
	Adaptive Server Enterprise Acquired Company	1987	Relational	Supported	SQL, Stored Procedures	Supported	Acquired Company
	Advantage Database Server xBase Acquired Company	1993	Relational	—	SQL	—	xBase Acquired Company
	Aerospike NoSQL AI-Assisted	2009	Document / XML, Key-Value, Vector	Not Supported	Custom API	Supported	NoSQL AI-Assisted
	AGEDB Middleware AI-Assisted	2019	Graph	—	Cypher, SQL	—	Middleware AI-Assisted
	AgensGraph Forked Code Multi-Model Acquired Company	2013	Document / XML, Graph, Key-Value, Relational	—	Cypher, SQL	Supported	Forked Code Multi-Model Acquired Company
	AionDB Multi-Model	2026	Vector, Graph, Relational	—	SQL, Cypher	—	Multi-Model
	Aito Search Engine	2017	Relational	Supported	—	—	Search Engine
	AKDB Abandoned	2009	Relational	—	SQL	—	Abandoned
	Akiban Acquired Company Abandoned	2009	—	—	SQL	—	Acquired Company Abandoned
	AlaSQL AI-Assisted	2014	Document / XML, Relational	Supported	SQL	—	AI-Assisted
AL	AlchemyDB Acquired Company Abandoned	2010	Relational	—	SQL	—	Acquired Company Abandoned
	Alenka Abandoned	2012	Relational	—	SQL	—	Abandoned
	AllegroGraph	2004	Triplestore / RDF	—	SPARQL, RDFS++	Supported
	AlloyDB OLAP Forked Code OLTP	2022	Relational	Supported	HTTP / REST, SQL, Stored Procedures	Supported	OLAP Forked Code OLTP
	Altibase OLTP	1999	Relational	Supported	SQL	Supported	OLTP
	Amelie OLTP	2023	Relational	—	SQL	—	OLTP
	AncelusDB	1983	Entity-Relationship	—	SQL	—
	AntDB Forked Code	—	Relational	—	SQL	—	Forked Code
	Antidote	2015	Key-Value	—	SQL	—
	Apollo xBase	1999	—	—	Custom API, SQL	—	xBase
	ArangoDB Multi-Model AI-Assisted	2011	Document / XML, Graph, Key-Value	Not Supported	Custom API, HTTP / REST, Command-line / Shell	Supported	Multi-Model AI-Assisted
	ArcadeDB Forked Code AI-Assisted	2021	Document / XML, Graph, Key-Value, Relational	—	SQL, HTTP / REST, Cypher	Supported	Forked Code AI-Assisted
	AresDB OLAP Abandoned	2018	Relational	Supported	Custom API	Not Supported	OLAP Abandoned
	AriaSQL Abandoned	2024	Relational	Supported	Command-line / Shell, SQL, Stored Procedures	Supported	Abandoned
	Ark	2026	Relational	—	SQL	—
	Arroyo Acquired Company Streaming	2023	Relational	—	SQL	—	Acquired Company Streaming
	AsaDB DBM	2026	Relational	—	SQL	—	DBM
	Aster Data OLAP Acquired Company	2005	Relational	—	SQL	—	OLAP Acquired Company
	AsterixDB OLAP AI-Assisted	2009	Document / XML	—	Custom API	Supported	OLAP AI-Assisted
	Atoti OLAP	2005	Relational	Supported	Custom API	—	OLAP
	Aurora	2014	Relational	Supported	SQL	Supported
	Aurora DSQL Serverless OLTP	2023	Relational	—	SQL	—	Serverless OLTP
	Axibase Time-Series Failed Company	2004	—	—	SQL	—	Time-Series Failed Company
	Axion Abandoned	2002	Relational	—	SQL	—	Abandoned
	Azure HorizonDB Forked Code	2026	Relational	Supported	PL/SQL	Supported	Forked Code
	Azure SQL Database Hosting Service	2009	Relational	Supported	SQL	Supported	Hosting Service
	BaikalDB	2018	Relational	—	SQL	—
	BASIS	—	Relational	—	SQL	—
	Beagle SQL Abandoned	1996	Relational	—	SQL	—	Abandoned
	Bedrock Blockchain OLTP AI-Assisted	2016	Relational	Supported	SQL, Command-line / Shell	Supported	Blockchain OLTP AI-Assisted
	BemiDB	2024	Relational	—	SQL	—
	Berkeley DB Acquired Company OLTP DBM	1994	Document / XML, Key-Value	Supported	Custom API, SQL, PL/SQL	Not Supported	Acquired Company OLTP DBM
	BigQuery OLAP Serverless	2010	Document / XML, Relational	—	SQL	—	OLAP Serverless
	BitYota Acquired Company	2011	Relational	—	SQL	—	Acquired Company
	BlackRay Failed Company	2005	Relational	—	SQL	—	Failed Company
	Blazegraph Acquired Company Abandoned	2006	Graph, Triplestore / RDF	Supported	SPARQL	Supported	Acquired Company Abandoned
	BlazingSQL OLAP Abandoned Failed Company	2015	Relational	—	SQL	Not Supported	OLAP Abandoned Failed Company
	BlinkDB Abandoned	2012	Relational	—	SQL	—	Abandoned
	BlobCity Failed Company	2015	Document / XML, Relational	—	SQL	Supported	Failed Company
	Brytlyt OLAP Forked Code Acquired Company	2013	Relational	Supported	PL/SQL	—	OLAP Forked Code Acquired Company
BU	Bunny Database Serverless	2023	Relational	—	SQL	—	Serverless
	BusTub	2019	Relational	—	SQL	Not Supported
	ByConity OLAP Abandoned	2020	Relational	—	SQL	—	OLAP Abandoned
	Caché	1997	Array / Matrix	—	SQL	—
	CamusDB NewSQL AI-Assisted	2021	Key-Value, Relational	—	RPC, HTTP / REST, SQL	—	NewSQL AI-Assisted
	CedarDB OLAP Forked Code OLTP	2023	Relational, Array / Matrix	—	SQL	—	OLAP Forked Code OLTP
CH	ChaiSQL	2018	Document / XML	—	SQL	—
	chaozzDB Abandoned	2008	—	—	SQL	—	Abandoned
	chDB OLAP Acquired Company AI-Assisted	2023	Relational	Not Supported	SQL	Not Supported	OLAP Acquired Company AI-Assisted
	CheetahDB	2018	Relational	—	SQL	—
	Citus OLAP Acquired Company AI-Assisted	2010	Relational	—	SQL	—	OLAP Acquired Company AI-Assisted
	ClearDB Acquired Company	2010	Relational	Supported	SQL, Stored Procedures	Supported	Acquired Company
	ClickHouse OLAP AI-Assisted	2016	Relational	Not Supported	Command-line / Shell, Custom API, HTTP / REST, SQL	Not Supported	OLAP AI-Assisted
	Cloudberry OLAP Forked Code Revival Project	2023	Relational	—	SQL	—	OLAP Forked Code Revival Project
	Cloud Datastore NoSQL	2013	Document / XML	Not Supported	Custom API, HTTP / REST, SQL	Not Supported	NoSQL
	Cloud Spanner NewSQL	2007	—	—	SQL	Not Supported	NewSQL
	Cloud SQL Hosting Service	2012	Relational	—	SQL	—	Hosting Service
	Clustrix NewSQL Acquired Company OLTP	2006	Relational	Supported	SQL, Stored Procedures	Supported	NewSQL Acquired Company OLTP
	CnosDB Time-Series Abandoned	2021	Relational	—	SQL	—	Time-Series Abandoned
	CockroachDB NewSQL OLTP AI-Assisted	2014	Relational	Supported	SQL	Supported	NewSQL OLTP AI-Assisted
	CoGaDB Abandoned	2012	Relational	—	SQL	—	Abandoned
	Comdb2 AI-Assisted	2004	Relational	—	SQL	—	AI-Assisted
	ComputeDB OLAP Acquired Company Abandoned	2015	Relational	—	SQL	—	OLAP Acquired Company Abandoned
	Cosmos DB	2015	Key-Value, Graph, Column Family / Wide-Column	—	SQL, Stored Procedures	Supported
	Couchbase NoSQL	2010	Key-Value, Document / XML	Not Supported	Custom API	Supported	NoSQL
	CovenantSQL Abandoned Blockchain	2018	Relational	Supported	SQL	Not Supported	Abandoned Blockchain
	CrateDB	2014	—	Not Supported	Command-line / Shell, HTTP / REST, SQL	Not Supported
	C-Store Abandoned	2005	Relational	Supported	SQL	Not Supported	Abandoned
	cubeSQL Acquired Company	2003	Relational	—	SQL	—	Acquired Company
	Cubrick	2016	Column Family / Wide-Column	—	SQL	—
	Cubrid AI-Assisted	2008	Relational	Supported	Custom API, SQL, Command-line / Shell, Stored Procedures	Supported	AI-Assisted
	CursusDB Abandoned NoSQL	2023	Document / XML	—	SQL	—	Abandoned NoSQL
	Daffodil DB Abandoned OLTP	2003	Relational	—	SQL	—	Abandoned OLTP
	Databend AI-Assisted	2020	Relational	—	SQL	—	AI-Assisted
DA	DataBlitz OLTP	1993	Relational	—	Custom API, SQL	—	OLTP
	DataEase Acquired Company OLTP	1981	Relational	Supported	SQL	—	Acquired Company OLTP
	DataFusion Query Engine AI-Assisted	2016	Relational	—	SQL	—	Query Engine AI-Assisted
	DATAllegro OLAP Acquired Company	2003	Relational	—	SQL	—	OLAP Acquired Company
	Datomic Acquired Company	2012	Key-Value	Supported	Datalog	Supported	Acquired Company
	Db2	1983	Document / XML, Relational	Supported	SQL, Stored Procedures	Supported
	DB9 Serverless OLTP	2026	Relational	—	SQL	—	Serverless OLTP
	DBIX	1996	—	—	SQL	—
	DBMaker	1994	Relational	—	SQL	—
	DBx1000 Abandoned	2014	Relational	—	—	Supported	Abandoned
	DeepDB Abandoned Failed Company	2010	Relational	—	SQL	—	Abandoned Failed Company
	Derby Acquired Company Abandoned OLTP	1997	Relational	Supported	SQL	Supported	Acquired Company Abandoned OLTP
	DeveelDB Abandoned OLTP	2009	Relational	—	SQL	—	Abandoned OLTP
	DeviceSQL Streaming	1998	Relational	—	SQL	—	Streaming
	DGraph Acquired Company AI-Assisted	2015	Graph	Supported	GraphQL	Supported	Acquired Company AI-Assisted
DI	DIRECT OLTP	1978	Relational	—	SQL	—	OLTP
DI	discodb Parody / Joke	2026	Relational	—	SQL	—	Parody / Joke
	DolphinDB Time-Series	2018	Relational	—	SQL	—	Time-Series
	Dolt Versioning AI-Assisted	2018	Relational	Supported	Custom API, SQL, Command-line / Shell	Supported	Versioning AI-Assisted
	Doris OLAP AI-Assisted	2017	Relational	—	SQL	—	OLAP AI-Assisted
DQ	Dqlite	2017	Relational	—	SQL	—
	Dremio OLAP Query Engine Acquired Company Abandoned Data Lake	2015	Relational	—	SQL	—	OLAP Query Engine Acquired Company Abandoned Data Lake
DR	DriftDB Immutable AI-Assisted	2025	Relational	—	SQL	—	Immutable AI-Assisted
	Drill OLAP AI-Assisted	2012	Column Family / Wide-Column	Supported	SQL, HTTP / REST	Not Supported	OLAP AI-Assisted
	Drizzle Forked Code Abandoned	2008	Relational	Supported	SQL	Supported	Forked Code Abandoned
	Druid OLAP AI-Assisted	2011	Column Family / Wide-Column	—	Custom API, SQL, HTTP / REST	Not Supported	OLAP AI-Assisted
	DuckDB OLAP Acquired Company AI-Assisted	2018	Relational	Supported	Custom API	Not Supported	OLAP Acquired Company AI-Assisted
	DynamoDB OLTP NoSQL	2012	Document / XML, Key-Value	Not Supported	Command-line / Shell, Custom API, PartiQL, SQL	Not Supported	OLTP NoSQL
	EdgelessDB Abandoned	2021	Relational	—	SQL	—	Abandoned
	EffiProz Abandoned	—	Relational	—	SQL	—	Abandoned
	EJDB	2012	Key-Value, Document / XML	Supported	Custom API, HTTP / REST	—
	ElaSQL Abandoned	2016	Relational	—	SQL	—	Abandoned
	ElevateDB	2006	Relational	Supported	SQL	Supported
	Eloquera	2008	Object-Oriented	—	Custom API, SQL	—
EM	EmbedDB Time-Series	2023	Relational	—	Custom API, SQL	—	Time-Series
	Empress	1979	Relational	—	SQL	—
	Endatabas OLAP Abandoned OLTP Immutable	2023	Document / XML, Relational	—	HTTP / REST, SQL	—	OLAP Abandoned OLTP Immutable
	EraDB Acquired Company	2019	Document / XML	—	SQL	—	Acquired Company
	EsgynDB Failed Company	2015	Relational	Supported	SQL, Command-line / Shell, PL/SQL, Stored Procedures	Supported	Failed Company
	EVA DB Abandoned	2018	Relational	—	SQL	—	Abandoned
	EventQL OLAP Abandoned	2014	Relational	—	SQL	—	OLAP Abandoned
EV	EvolvSQL OLTP	2026	Relational	—	SQL	—	OLTP
	Exasol OLAP	2000	Relational	Supported	SQL	Supported	OLAP
	ExtendDB Middleware AI-Assisted	2026	Key-Value, Document / XML	—	Custom API, HTTP / REST	—	Middleware AI-Assisted
	eXtremeDB Cache Time-Series OLTP Middleware	2001	Column Family / Wide-Column, Entity-Relationship, Key-Value, Relational	Supported	Command-line / Shell, Custom API, HTTP / REST, RPC, SQL, Stored Procedures	Supported	Cache Time-Series OLTP Middleware
	FastDB MMAP	2011	Relational	—	Custom API, SQL	—	MMAP
	FaunaDB Serverless Failed Company	2012	Document / XML, Graph, Key-Value, Relational	Supported	GraphQL	Supported	Serverless Failed Company
	FBase Time-Series Abandoned	2022	Relational	—	SQL	—	Time-Series Abandoned
	FeatureBase Abandoned Search Engine	2017	Relational	Supported	Custom API, HTTP / REST, SQL, Command-line / Shell	Not Supported	Abandoned Search Engine
FE	Ferrite OLTP	2024	Relational	—	SQL	—	OLTP
FI	FileDb Abandoned NoSQL	2011	Relational	—	Custom API, SQL	—	Abandoned NoSQL
	FileMaker Acquired Company	1985	Relational	Supported	Custom API, SQL	Not Supported	Acquired Company
	Firebird AI-Assisted	2000	Relational	Supported	Custom API, SQL, Command-line / Shell, Stored Procedures	Supported	AI-Assisted
	Firebolt OLAP Forked Code	2020	Relational	—	SQL	—	OLAP Forked Code
	FirstSQL/J Failed Company	2001	Relational	Supported	Command-line / Shell, Custom API, SQL, Stored Procedures	Supported	Failed Company
	Floe OLAP Forked Code Data Lake	2025	Relational	—	Model Context Protocol, SQL	—	OLAP Forked Code Data Lake
	Fluree Blockchain AI-Assisted	2017	Document / XML, Graph, Triplestore / RDF, Relational	—	SPARQL, Custom API, SQL, HTTP / REST, GraphQL	—	Blockchain AI-Assisted
	Frigatebird OLAP	2025	Relational	—	SQL	—	OLAP
	FrontBase OLTP	1993	Relational	Supported	SQL	—	OLTP
GA	Gamma OLAP Abandoned OLTP	1986	Relational	—	SQL	Not Supported	OLAP Abandoned OLTP
	GaussDB	2011	Relational	—	SQL	—
	Gel OLAP AI-Assisted	2018	Relational	Not Supported	Custom API, SQL, HTTP / REST, Command-line / Shell, GraphQL	Supported	OLAP AI-Assisted
	GenieDB Failed Company Hosting Service	2008	Relational	—	SQL	—	Failed Company Hosting Service
	GeoSpock DB Failed Company	2013	Relational	—	SQL	—	Failed Company
	GlareDB Abandoned Middleware AI-Assisted	2022	Relational	—	SQL	—	Abandoned Middleware AI-Assisted
	Goldilocks	2010	Relational	—	Custom API, SQL	—
GO	Google F1	2013	Relational	Supported	SQL	—
GR	GRACE Abandoned	1981	Relational	—	SQL	—	Abandoned
	Grafeo AI-Assisted	2026	Graph, Triplestore / RDF	—	Cypher, GraphQL, Gremlin, HTTP / REST, SPARQL, SQL	—	AI-Assisted
	GraphDB	2000	Triplestore / RDF	—	SPARQL	Supported
	GrapheneDB Hosting Service	2012	Graph	Not Supported	Cypher	Supported	Hosting Service
	GreatSQL	2020	Relational	—	SQL	—
	Greenplum OLAP Forked Code Acquired Company	2003	Relational	Supported	PL/SQL, SQL	Not Supported	OLAP Forked Code Acquired Company
	GreptimeDB Time-Series AI-Assisted	2022	Relational	—	HTTP / REST, PromQL, SQL	—	Time-Series AI-Assisted
	GridDB	2011	Key-Value	—	Custom API, SQL, Command-line / Shell, HTTP / REST	Not Supported
	GridGain Acquired Company	2007	Key-Value	Not Supported	Custom API	Supported	Acquired Company
	H2	2004	Relational	Supported	SQL	Supported
	Hadapt OLAP Acquired Company Middleware	2009	Relational	Not Supported	SQL	—	OLAP Acquired Company Middleware
	HANA	2010	Column Family / Wide-Column	Supported	Custom API, SQL	Supported
	HarperDB Serverless NoSQL	2017	Document / XML	—	SQL	—	Serverless NoSQL
	HAWQ OLAP Abandoned Middleware	2015	Relational	—	SQL	—	OLAP Abandoned Middleware
	HeavyDB Abandoned	2013	Relational	—	Command-line / Shell, Custom API, RPC, SQL	—	Abandoned
	Hekaton OLTP	2012	Relational	—	SQL	Supported	OLTP
	HerdDB Abandoned	2016	Relational	Not Supported	Custom API, SQL, Command-line / Shell	Not Supported	Abandoned
	HexaDB	2023	Relational	—	SQL	—
	HFSQL	—	—	—	SQL	—
	Hive OLAP AI-Assisted	2010	Relational	—	SQL	Supported	OLAP AI-Assisted
	HoraeDB Time-Series Abandoned	2021	Relational	—	HTTP / REST, SQL	—	Time-Series Abandoned
	H-Store NewSQL Abandoned OLTP	2006	Relational	—	SQL, Stored Procedures	Supported	NewSQL Abandoned OLTP
	HStreamDB Abandoned Streaming	2020	Relational	Not Supported	Custom API, SQL	Not Supported	Abandoned Streaming
	Hydra OLAP Abandoned Failed Company	2022	Relational	—	SQL	—	OLAP Abandoned Failed Company
	HyPer OLAP Acquired Company OLTP	2010	Relational	Supported	SQL, PL/SQL	Supported	OLAP Acquired Company OLTP
	HyperSQL	2001	Relational	—	SQL	—
	Hyrise OLAP	2009	Relational	—	SQL, Stored Procedures	Supported	OLAP
	Icecoal Abandoned	2020	Relational	—	SQL	—	Abandoned
	Ignite	2014	Key-Value	Not Supported	SQL	Supported
	Illustra Acquired Company OLTP	1992	Relational	—	SQL	—	Acquired Company OLTP
	Impala OLAP AI-Assisted	2013	Relational	—	Custom API, SQL	Supported	OLAP AI-Assisted
	IMS OLTP	1966	Hierarchical	—	Custom API, HTTP / REST, SQL	—	OLTP
	InfiniDB OLAP Abandoned Failed Company	2000	Relational	Supported	SQL	—	OLAP Abandoned Failed Company
	InfiniSQL Abandoned OLTP	2013	Relational	—	SQL	—	Abandoned OLTP
	Infinity Nearest Neighbor	2022	Relational	—	Custom API, SQL	—	Nearest Neighbor
	Infino Query Engine Nearest Neighbor MMAP	—	Relational	—	SQL	—	Query Engine Nearest Neighbor MMAP
	InfluxDB Time-Series AI-Assisted	2013	Column Family / Wide-Column	Not Supported	Custom API, SQL, HTTP / REST	Not Supported	Time-Series AI-Assisted
	Infobright OLAP Acquired Company	2005	Relational	Not Supported	Custom API	Supported	OLAP Acquired Company
	InfoFrame Abandoned	2013	Relational	—	SQL	—	Abandoned
	Informix Acquired Company	1980	Relational	Supported	Command-line / Shell, SQL, Stored Procedures	Supported	Acquired Company
	Ingres Acquired Company	1974	Relational	Supported	Custom API, QUEL, SQL, Stored Procedures	Supported	Acquired Company
	InMemory.Net	2014	Relational	—	SQL	—
	InterBase Versioning Acquired Company	1984	Relational	Supported	SQL, Stored Procedures	Supported	Versioning Acquired Company
	IoTDB Time-Series AI-Assisted	2017	Hierarchical	Not Supported	Custom API, SQL	Supported	Time-Series AI-Assisted
	IQ Acquired Company	1992	Relational	—	SQL, Stored Procedures	—	Acquired Company
	ITTIA DB Time-Series OLTP	2000	Relational	Supported	SQL	—	Time-Series OLTP
	JaguarDB Nearest Neighbor	2017	Array / Matrix, Key-Value	Supported	Command-line / Shell, Custom API, SQL	Supported	Nearest Neighbor
	Jazz AI-Assisted	2026	Relational	—	SQL	—	AI-Assisted
	JoinBase Time-Series Abandoned	—	Relational	—	SQL	—	Time-Series Abandoned
	JSqlDb	2017	Document / XML	—	—	Supported
	Just Logic/SQL OLTP	1994	Relational	Supported	SQL	Supported	OLTP
	JustOneDB Acquired Company	2010	Relational	—	SQL	—	Acquired Company
	KantoDB OLTP	2025	Relational	—	SQL	—	OLTP
KA	KarelDB Abandoned	2019	Relational	—	SQL	—	Abandoned
	Kdb+ Acquired Company	1998	Relational	Supported	HTTP / REST, SQL	Supported	Acquired Company
KE	KekeDB	—	Relational	—	SQL	—
	Kerf	2014	—	—	SQL, HTTP / REST	—
	Kinetica OLAP	2009	Relational	—	HTTP / REST, SQL	Supported	OLAP
	ksqlDB Streaming AI-Assisted	2017	Key-Value, Relational	Supported	Custom API, SQL, Command-line / Shell	—	Streaming AI-Assisted
	Kubl Acquired Company	1994	Relational	—	SQL	—	Acquired Company
	Kunlun Abandoned	2019	Relational	—	SQL	—	Abandoned
	Kylin	2013	Key-Value	Supported	SQL	—
	Kyuubi Middleware AI-Assisted	2017	Relational	—	SQL	—	Middleware AI-Assisted
	lakeql Query Engine AI-Assisted	2026	Relational	—	SQL	—	Query Engine AI-Assisted
	LanceDB Search Engine AI-Assisted	2023	Document / XML	—	Custom API, SQL	—	Search Engine AI-Assisted
	LazyDB	2020	Document / XML	—	Custom API	Supported
	Lealone	2012	Relational	—	SQL	—
	LeanXcale OLAP OLTP	2010	Relational	—	SQL	—	OLAP OLTP
	libSQL Forked Code OLTP	2022	Relational	Supported	SQL	Not Supported	Forked Code OLTP
	LinDB Abandoned	2019	Column Family / Wide-Column	Not Supported	SQL	—	Abandoned
	LingoDB OLAP AI-Assisted	2021	Relational	—	SQL	—	OLAP AI-Assisted
	Linter	1990	Relational	Supported	SQL, Stored Procedures	Supported
	LiteDB AI-Assisted	2014	Document / XML	—	SQL	—	AI-Assisted
LI	LittleD Abandoned	2014	Relational	—	SQL	—	Abandoned
LL	LlamaDB Abandoned	2015	Relational	—	Command-line / Shell, SQL	—	Abandoned
	LocalSQL	2001	Relational	—	SQL	—
	Lovefield Web Browser Abandoned	2014	Relational	—	SQL	—	Web Browser Abandoned
	MammothDB OLAP Acquired Company	2012	Relational	—	SQL	Not Supported	OLAP Acquired Company
	Manticore Search Search Engine	2017	Relational	Not Supported	HTTP / REST, SQL	—	Search Engine
	MariaDB AI-Assisted	2009	Relational	Supported	Custom API, SQL, Stored Procedures	Supported	AI-Assisted
	Materialize Streaming AI-Assisted	2019	Relational	Not Supported	SQL	—	Streaming AI-Assisted
	Matisse OLTP	1986	Document / XML, Object-Oriented	—	Custom API, SQL	—	OLTP
	MatrixOne OLAP OLTP Streaming AI-Assisted	2021	Relational	—	SQL	—	OLAP OLTP Streaming AI-Assisted
	MaxDB OLTP	1977	Relational	Supported	SQL	Supported	OLTP
	Mckoi SQL Database Abandoned Failed Company	1998	Relational	—	SQL	—	Abandoned Failed Company
	MemCP OLAP AI-Assisted	2022	Relational	—	HTTP / REST, SQL	—	OLAP AI-Assisted
	Mimer SQL	1974	Relational	Supported	SQL	Supported
MK	mkdb Abandoned	2023	Relational	—	SQL	—	Abandoned
	MLDB Acquired Company Abandoned	2015	—	—	HTTP / REST, SQL	—	Acquired Company Abandoned
MO	Model 204 Acquired Company	1965	Entity-Attribute-Value	—	SQL	—	Acquired Company
	ModeShape Abandoned	2008	Object-Oriented	—	Custom API, SQL, HTTP / REST	—	Abandoned
	MonetDB OLAP MMAP	2002	Column Family / Wide-Column	Supported	SQL	Supported	OLAP MMAP
	MonographDB	2021	Relational	—	SQL	—
	MotherDuck Hosting Service	2022	Relational	—	Model Context Protocol, SQL	—	Hosting Service
	mSQL	1994	Relational	—	SQL	—
	Multigres Middleware AI-Assisted	2025	Relational	Supported	PL/SQL	Supported	Middleware AI-Assisted
	MyScaleDB OLAP Forked Code Abandoned Failed Company AI-Assisted	2021	Relational	—	SQL	—	OLAP Forked Code Abandoned Failed Company AI-Assisted
	MySQL Acquired Company	1994	Relational	Supported	SQL	Supported	Acquired Company
	Napa	2018	Relational	—	SQL	—
	NavDB Abandoned	2017	Key-Value, Relational	—	Command-line / Shell, Custom API, SQL	—	Abandoned
	NCache Cache	2015	Key-Value	—	SQL	—	Cache
	Neo4j NoSQL AI-Assisted	2007	Graph	Supported	Cypher	Supported	NoSQL AI-Assisted
	Neon Serverless Forked Code Acquired Company OLTP	2021	Relational	Supported	HTTP / REST, PL/SQL, SQL	Supported	Serverless Forked Code Acquired Company OLTP
NE	Neoview Abandoned	2007	Relational	—	SQL	—	Abandoned
	Neptune	2018	Graph, Triplestore / RDF	Supported	SPARQL, HTTP / REST, Gremlin	—
	Netezza OLAP Acquired Company	1999	Relational	Supported	SQL	Supported	OLAP Acquired Company
	Netlify Database Serverless Hosting Service	2024	Relational	Supported	SQL	Supported	Serverless Hosting Service
	NexusDB OLTP	2003	Relational	Supported	Custom API, SQL	Supported	OLTP
	Nile OLTP	2022	Relational	—	SQL	—	OLTP
	NodeDB Multi-Model Nearest Neighbor AI-Assisted	2026	Vector, Graph, Array / Matrix, Document / XML, Relational	—	SQL, Cypher	—	Multi-Model Nearest Neighbor AI-Assisted
	NoisePage Abandoned	2018	Relational	—	SQL	Supported	Abandoned
	NonStop SQL Acquired Company OLTP	1987	Relational	—	SQL	—	Acquired Company OLTP
	NuoDB NewSQL Acquired Company	2010	Relational	Supported	SQL	Supported	NewSQL Acquired Company
	ObjectBox Time-Series Nearest Neighbor MMAP Mobile NoSQL	2016	Object-Oriented	Supported	Custom API	Not Supported	Time-Series Nearest Neighbor MMAP Mobile NoSQL
	ObsessionDB OLAP Hosting Service	2024	Relational	Not Supported	SQL	Not Supported	OLAP Hosting Service
	OceanBase	2010	Relational	Supported	SQL	Supported
	Ocelot Failed Company	2001	Relational	—	SQL	—	Failed Company
	Ocient	2016	Relational	—	SQL	—
	OctoSQL Query Engine Abandoned	2019	Relational	—	SQL, Command-line / Shell	—	Query Engine Abandoned
	OneDB	2020	Relational	Supported	SQL	Supported
	OpenEdge OLTP	1984	Relational	Supported	Custom API, SQL	Supported	OLTP
	openGemini Time-Series AI-Assisted	2022	Relational	—	SQL	—	Time-Series AI-Assisted
OP	open-gpdb OLAP Forked Code	2024	Relational	Supported	SQL	Supported	OLAP Forked Code
	OpenMLDB	2017	Relational	—	SQL, HTTP / REST	—
	Opteryx OLAP Serverless AI-Assisted	2021	Relational	—	SQL, Command-line / Shell	—	OLAP Serverless AI-Assisted
	Oracle Multi-Model	1977	Document / XML, Graph, Key-Value, Relational, Triplestore / RDF	Supported	SQL	Supported	Multi-Model
	OrientDB Multi-Model Acquired Company NoSQL	2010	Document / XML, Graph, Key-Value, Object-Oriented	—	GraphQL, Gremlin, HTTP / REST, SQL, Stored Procedures	Supported	Multi-Model Acquired Company NoSQL
	OrioleDB Acquired Company AI-Assisted	2021	Relational	—	SQL	—	Acquired Company AI-Assisted
	OushuDB	2016	Relational	—	SQL	—
	OxidSQL Abandoned	2022	Relational	—	SQL	—	Abandoned
	Oxla OLAP Acquired Company	2020	Relational	—	SQL	—	OLAP Acquired Company
	ParAccel OLAP Acquired Company	2006	Relational	—	SQL	—	OLAP Acquired Company
	ParadeDB OLAP Nearest Neighbor Search Engine AI-Assisted	2023	Relational	—	SQL	—	OLAP Nearest Neighbor Search Engine AI-Assisted
	Paradox Acquired Company Abandoned	1985	Relational	—	SQL	—	Acquired Company Abandoned
	ParStream OLAP Acquired Company Abandoned	2010	Relational	—	SQL	—	OLAP Acquired Company Abandoned
	Percona Server Forked Code	2006	Relational	Supported	SQL	Supported	Forked Code
	Phoenix Middleware AI-Assisted	2014	Relational	—	SQL	—	Middleware AI-Assisted
PI	PI Time-Series Acquired Company	1980	Hierarchical, Relational	—	Custom API, HTTP / REST, SQL	—	Time-Series Acquired Company
	picoSQL Abandoned	1995	Relational	—	SQL	—	Abandoned
	PieCloudDB OLAP	2021	Relational	—	SQL	Supported	OLAP
	Pinot OLAP AI-Assisted	2014	Relational	—	SQL	—	OLAP AI-Assisted
	PinusDB Abandoned	2019	Relational	—	SQL	—	Abandoned
	PipelineDB Acquired Company Abandoned Streaming	2013	Relational	—	SQL	—	Acquired Company Abandoned Streaming
	PlanetScale Forked Code OLTP	2018	Relational	—	SQL	—	Forked Code OLTP
	pocketSQL Abandoned	2001	Relational	—	SQL	—	Abandoned
	PointBase Acquired Company	1998	Relational	—	SQL	—	Acquired Company
	PolarDB AI-Assisted	2017	Relational	—	SQL	—	AI-Assisted
	Polyhedra Acquired Company	1994	Relational	—	Custom API, SQL	—	Acquired Company
	Polypheny Multi-Model	2017	Document / XML, Graph, Relational	—	Cypher, HTTP / REST, SQL	—	Multi-Model
	PosDB OLAP	2017	Relational	Not Supported	Custom API, SQL	Not Supported	OLAP
	PostgreSQL OLTP	1986	Relational	Supported	PL/SQL	Supported	OLTP
	PouchDB Web Browser NoSQL	2010	Document / XML	Not Supported	Custom API	Supported	Web Browser NoSQL
PR	PranaDB Abandoned	2022	Relational	—	SQL	—	Abandoned
	PrestoDB OLAP AI-Assisted	2013	Document / XML, Key-Value, Column Family / Wide-Column, Relational	Not Supported	SQL	Supported	OLAP AI-Assisted
	PrimeBase OLTP	1990	Relational	Supported	SQL	—	OLTP
	Proton Streaming AI-Assisted	2021	Relational	—	SQL	—	Streaming AI-Assisted
	ProtonBase OLAP	2021	Document / XML, Relational	—	SQL	—	OLAP
	PuffinDB Serverless Abandoned	2023	Relational	—	SQL	—	Serverless Abandoned
	qikkDB OLAP Abandoned Failed Company	2019	Relational	—	SQL	—	OLAP Abandoned Failed Company
	ql AI-Assisted	2013	Relational	—	SQL	—	AI-Assisted
	Quadcap Embeddable Database Failed Company	1999	Relational	—	SQL	—	Failed Company
	QuestDB Time-Series AI-Assisted	2014	Relational	Not Supported	SQL	Not Supported	Time-Series AI-Assisted
QU	Quickbase Abandoned	1993	Relational	—	SQL, Stored Procedures	Supported	Abandoned
	Quickstep OLAP Abandoned	2013	Relational	—	SQL	—	OLAP Abandoned
	Quokka OLAP Abandoned	2021	Relational	—	SQL	—	OLAP Abandoned
	RadonDB Abandoned Failed Company	2018	Relational	—	SQL	—	Abandoned Failed Company
	RaimaDB Time-Series	1984	Network, Relational	Supported	Command-line / Shell, Custom API, PL/SQL, SQL, Stored Procedures	Supported	Time-Series
	RainStor Acquired Company	2004	Relational	—	SQL	—	Acquired Company
	RamSQL Abandoned	2014	Relational	—	SQL	—	Abandoned
	RapidsDB OLAP Middleware	2014	—	—	SQL	—	OLAP Middleware
	RaptorDB Forked Code	2024	Relational	Supported	PL/SQL	Supported	Forked Code
	Rasdaman	1989	Array / Matrix	—	SQL	—
	R:BASE Acquired Company	1981	Relational	Supported	Command-line / Shell, SQL	Supported	Acquired Company
	Rdb/VMS Acquired Company	1984	Relational	Supported	SQL	Supported	Acquired Company
	ReadySet Cache Middleware AI-Assisted	2020	Relational	—	SQL	—	Cache Middleware AI-Assisted
	Reality Acquired Company	1973	Multi-Value, Relational	—	Custom API, SQL	—	Acquired Company
	Red Brick OLAP Acquired Company	1990	Relational	—	SQL	—	OLAP Acquired Company
	RedDatabase Forked Code	2006	Relational	Supported	SQL	Supported	Forked Code
	RedisGraph Abandoned	2018	Graph	Not Supported	Cypher, Command-line / Shell, Stored Procedures	Supported	Abandoned
	RediSQL Abandoned	2016	Relational	—	SQL	—	Abandoned
	RedoxQL Abandoned	2024	Relational	—	SQL	—	Abandoned
	Redshift OLAP Serverless	2012	Relational	Supported	PartiQL, SQL	Not Supported	OLAP Serverless
	RegattaDB OLAP OLTP	2020	Relational	—	SQL	—	OLAP OLTP
	Rel	2004	Relational	Supported	Custom API	—
	RelationalAI	2018	Graph, Relational	—	Custom API, SQL	—
	RelationalCloud Abandoned	2010	Relational	—	SQL	—	Abandoned
	RexDB Acquired Company	2006	Relational	Supported	Custom API, PL/SQL, SQL	Supported	Acquired Company
	RisingLight Abandoned	2021	Relational	Not Supported	SQL	Not Supported	Abandoned
	RisingWave Streaming AI-Assisted	2021	Relational	Not Supported	SQL	Supported	Streaming AI-Assisted
	Rockset OLAP Acquired Company	2016	Relational	—	HTTP / REST, SQL	—	OLAP Acquired Company
	RonDB OLTP AI-Assisted	2020	Key-Value, Relational	Supported	Custom API, HTTP / REST, SQL	—	OLTP AI-Assisted
	Rosebase Failed Company	1992	Relational	—	SQL	—	Failed Company
	rqlite AI-Assisted	2014	Relational	Supported	SQL, HTTP / REST	Not Supported	AI-Assisted
	RubatoDB	2014	Key-Value	—	SQL	—
	Sadas Engine OLAP	—	Relational	—	SQL	—	OLAP
SB	sboxdb	2024	Relational	—	SQL	—
	SchemafreeSQL	2012	Document / XML	—	SQL	—
	SciDB OLAP	2008	Array / Matrix	Not Supported	Command-line / Shell	Supported	OLAP
	ScimoreDB	2005	Relational	—	SQL	—
	ScopeDB	2024	Relational	—	HTTP / REST, SQL	—
	ScratchDB OLAP Abandoned Middleware Hosting Service	2023	Document / XML	—	HTTP / REST, SQL	—	OLAP Abandoned Middleware Hosting Service
	Scuba	2013	Relational	—	Custom API, SQL, HTTP / REST	—
	Seafowl OLAP Acquired Company Abandoned	2022	Relational	—	SQL	Supported	OLAP Acquired Company Abandoned
	SearchBlox Search Engine	2003	Document / XML	—	SQL, HTTP / REST	—	Search Engine
	SedonaDB Geospatial	2010	—	—	SQL	—	Geospatial
	SeekDB AI-Assisted	2025	Relational, Vector	—	Custom API, SQL	—	AI-Assisted
	SequoiaDB	2011	Document / XML	—	SQL, Command-line / Shell, HTTP / REST	Supported
	SereneDB OLAP OLTP Search Engine AI-Assisted	2024	Relational	—	SQL	—	OLAP OLTP Search Engine AI-Assisted
	ShardingSphere AI-Assisted	2016	Relational	—	SQL	—	AI-Assisted
	ShareBase Acquired Company	1979	Relational	—	SQL	—	Acquired Company
	shsql	2002	Relational	—	SQL, Command-line / Shell	—
	SingleStore OLAP NewSQL Acquired Company OLTP	2011	Document / XML, Key-Value, Multi-Value, Object-Oriented, Relational, Vector	Not Supported	HTTP / REST, PL/SQL, SQL	Supported	OLAP NewSQL Acquired Company OLTP
	Siodb Abandoned	2018	Relational	—	SQL	—	Abandoned
	Sirius OLAP Query Engine AI-Assisted	2024	Relational	—	SQL	—	OLAP Query Engine AI-Assisted
	SKDB OLTP AI-Assisted	2022	Relational	—	SQL	—	OLTP AI-Assisted
	SKSQL Abandoned	2021	Relational	—	SQL	—	Abandoned
	Skyrise OLAP Serverless Query Engine Abandoned	2019	Relational	—	SQL	—	OLAP Serverless Query Engine Abandoned
	SlothDB	2026	Relational	—	SQL	—
	SmallSQL Abandoned	2005	Relational	Supported	—	Not Supported	Abandoned
	Sneller	2022	Document / XML	—	SQL	—
	Snowflake OLAP	2013	Document / XML, Relational	Supported	SQL	Not Supported	OLAP
	SochDB AI-Assisted	2026	Graph, Relational, Vector	—	SQL	—	AI-Assisted
	solidDB Acquired Company OLTP	1992	Relational	Supported	Command-line / Shell, Custom API, HTTP / REST, SQL, Stored Procedures	Supported	Acquired Company OLTP
	SoloDB Serverless NoSQL	2024	Document / XML	Supported	Custom API, SQL	—	Serverless NoSQL
	SpaceTime	2020	Relational	—	HTTP / REST, SQL	—
	SpacetimeDB OLTP AI-Assisted	2023	Relational	—	Custom API, HTTP / REST, SQL	Supported	OLTP AI-Assisted
	SparkleDB OLTP	2013	Graph	—	SQL	—	OLTP
	Spark SQL OLAP AI-Assisted	2014	—	—	Custom API, SQL	Supported	OLAP AI-Assisted
	Speedy Abandoned	—	Relational	—	SQL	—	Abandoned
	Splice Machine Abandoned Failed Company	2012	Relational	—	SQL	—	Abandoned Failed Company
	Splunk Acquired Company Search Engine	2002	Key-Value	Supported	Custom API	Supported	Acquired Company Search Engine
	SQL Anywhere Acquired Company	1992	Relational	—	SQL	—	Acquired Company
	SQLBase Acquired Company	1984	Relational	—	SQL	—	Acquired Company
SQ	SQL/DS	1981	Relational	—	SQL	—
	SQLite OLTP	2000	Relational	Supported	Custom API, SQL	Not Supported	OLTP
	SQLite.Cloud OLTP Hosting Service	2020	Relational	—	SQL	—	OLTP Hosting Service
	SQL Server	1988	Relational	Supported	SQL	Supported
	SQream OLAP	2010	Relational	—	SQL	—	OLAP
SQ	Squirreling Query Engine Web Browser AI-Assisted	2025	Relational	—	SQL	—	Query Engine Web Browser AI-Assisted
	Stardog	2005	Triplestore / RDF	—	SQL, Datalog	—
	StarRocks OLAP AI-Assisted	2021	Relational, Column Family / Wide-Column	Supported	SQL	—	OLAP AI-Assisted
	StellarSQL Abandoned	2018	Relational	—	SQL	—	Abandoned
	StereoDB Abandoned OLTP	2023	Relational	—	SQL	—	Abandoned OLTP
	StoneDB OLAP Failed Company	2022	Relational	—	SQL	—	OLAP Failed Company
	Stoolap OLAP OLTP	2025	Relational	—	SQL	—	OLAP OLTP
	StormDB Acquired Company	2012	Relational	—	SQL	—	Acquired Company
	Supabase OLTP AI-Assisted Hosting Service	2020	—	—	SQL, HTTP / REST, GraphQL	—	OLTP AI-Assisted Hosting Service
	Supra Server SQL Acquired Company OLTP	1989	Relational	—	Custom API, SQL	—	Acquired Company OLTP
	SurrealDB Serverless Multi-Model AI-Assisted	2016	Document / XML, Graph, Relational	Not Supported	Custom API, HTTP / REST, RPC, SQL	Supported	Serverless Multi-Model AI-Assisted
	Swarm64 OLAP Acquired Company	2013	Relational	Supported	SQL	Supported	OLAP Acquired Company
	SWC-DB Abandoned	2019	Column Family / Wide-Column, Key-Value	—	Command-line / Shell, Custom API, SQL	—	Abandoned
	SwellDB Abandoned	2025	Relational	—	SQL	—	Abandoned
	SynapCores Multi-Model Nearest Neighbor	2026	Graph, Relational, Vector	—	Cypher, Model Context Protocol, SQL	—	Multi-Model Nearest Neighbor
SY	System R OLTP	1972	Relational	Supported	SQL	—	OLTP
	TabDB Parody / Joke Abandoned	2019	Relational	—	SQL	—	Parody / Joke Abandoned
	Tablespace	2024	—	—	SQL	—
	Tajo OLAP Abandoned	2012	Relational	—	Custom API, SQL, Command-line / Shell	—	OLAP Abandoned
	Tanzu GemFire Cache Acquired Company NoSQL	2002	Key-Value	—	Command-line / Shell, Custom API, SQL	—	Cache Acquired Company NoSQL
	Tarantool	2008	Key-Value	Not Supported	Custom API, Command-line / Shell, Stored Procedures	Supported
	TDengine Time-Series AI-Assisted	2017	Relational	Not Supported	Custom API, HTTP / REST, SQL, Command-line / Shell	Not Supported	Time-Series AI-Assisted
	TensorBase OLAP Abandoned Failed Company	2020	Relational	—	SQL	—	OLAP Abandoned Failed Company
TE	Tera Abandoned	2014	Column Family / Wide-Column	—	SQL	Not Supported	Abandoned
	Teradata	1979	Document / XML, Graph, Relational	Supported	—	—
	Tesora Acquired Company Middleware	2010	Relational	—	SQL	—	Acquired Company Middleware
	ThinkSQL Abandoned	2000	Relational	—	SQL	—	Abandoned
	Tibero OLTP	2003	Relational	—	Custom API, PL/SQL, SQL	—	OLTP
	TiDB NewSQL AI-Assisted	2015	Key-Value	Supported	SQL	Not Supported	NewSQL AI-Assisted
	TigerGraph	2012	Graph	Supported	Custom API, HTTP / REST	Supported
	TileDB NoSQL	2014	Array / Matrix	Not Supported	Custom API, SQL	Not Supported	NoSQL
	TimescaleDB Time-Series AI-Assisted	2017	Relational	Supported	PL/SQL, PromQL, SQL	Supported	Time-Series AI-Assisted
	TimesTen Acquired Company OLTP	1996	Relational	Supported	SQL	Supported	Acquired Company OLTP
	Timestream	2018	Relational	—	SQL	—
	TinyDB Query Engine Peer-to-Peer	1999	Relational	—	SQL	—	Query Engine Peer-to-Peer
TI	tinySQL xBase Abandoned	2003	Relational	—	Command-line / Shell, SQL	—	xBase Abandoned
	toyDB	2019	Relational	—	SQL	—
	Trafodion Abandoned	2014	Column Family / Wide-Column	Supported	SQL	Supported	Abandoned
	Transbase OLTP	1987	Relational	Supported	SQL	—	OLTP
	TransLattice NewSQL Failed Company	2007	Relational	Supported	SQL	Supported	NewSQL Failed Company
	Trino AI-Assisted	2019	—	—	SQL	—	AI-Assisted
	Truviso Acquired Company Streaming	2006	Relational	—	SQL	—	Acquired Company Streaming
	ts-sql Abandoned	2020	Relational	—	SQL	—	Abandoned
	TuGraph	2021	Graph	—	Cypher	Supported
	Turso OLTP AI-Assisted	2023	Relational	—	SQL	—	OLTP AI-Assisted
	Umbra OLAP OLTP	2018	Array / Matrix, Relational	—	SQL	—	OLAP OLTP
	Unbounded Failed Company	2020	Document / XML	—	Custom API	Supported	Failed Company
	upscaledb OLAP Abandoned	2007	Key-Value	—	Custom API, SQL	—	OLAP Abandoned
	Valentina Database OLTP	1998	Relational	Supported	SQL	Supported	OLTP
	VanillaDB Abandoned	2016	Multi-Value	Not Supported	Custom API, SQL, Stored Procedures	Not Supported	Abandoned
VE	vecdb Nearest Neighbor Search Engine MMAP	2026	Document / XML, Vector	—	Command-line / Shell, SQL	—	Nearest Neighbor Search Engine MMAP
	Vector OLAP Acquired Company	2009	Relational	Supported	SQL	Supported	OLAP Acquired Company
	VectorSQL OLAP Abandoned	2020	Relational	—	SQL	—	OLAP Abandoned
	VeloDB Hosting Service	2023	Relational, Vector	—	SQL	—	Hosting Service
	Velox OLAP Query Engine AI-Assisted	2020	Relational	Not Supported	Custom API	Supported	OLAP Query Engine AI-Assisted
	Vertica OLAP Forked Code Acquired Company	2005	Relational	Supported	Custom API, SQL	Not Supported	OLAP Forked Code Acquired Company
	Vespa Search Engine AI-Assisted	1997	Document / XML	—	Custom API, SQL	—	Search Engine AI-Assisted
	VillageSQL Forked Code OLTP Revival Project AI-Assisted	2025	Relational	Supported	SQL	Supported	Forked Code OLTP Revival Project AI-Assisted
	Virtuoso	1998	Relational	—	Custom API, SQL, HTTP / REST	—
	VistaDB	2009	—	—	SQL	—
	Visual FoxPro xBase	1992	Relational	—	SQL	—	xBase
	Vitess Middleware AI-Assisted	2011	Relational	Supported	SQL	Supported	Middleware AI-Assisted
	ViyaDB OLAP Abandoned	2017	Relational	—	HTTP / REST, SQL	—	OLAP Abandoned
	VoltDB NewSQL	2009	Relational	—	SQL, Stored Procedures	Supported	NewSQL
VS	vsql Abandoned	2021	Relational	—	SQL	—	Abandoned
	vyhodb Abandoned	2012	Network	—	Custom API	Supported	Abandoned
	WarehousePG Forked Code AI-Assisted	2025	Relational	Supported	SQL	Supported	Forked Code AI-Assisted
	WebScaleSQL Forked Code Abandoned	2014	Relational	Supported	SQL	Supported	Forked Code Abandoned
	WonderDB Abandoned OLTP	2013	Relational	—	SQL	—	Abandoned OLTP
	XAP NoSQL	2000	Document / XML	—	Custom API, SQL	—	NoSQL
	Xata Forked Code AI-Assisted	2020	Relational	Supported	HTTP / REST, SQL, Command-line / Shell	Supported	Forked Code AI-Assisted
XD	XDB Enterprise Server Acquired Company	1998	Relational	—	SQL	—	Acquired Company
	Xeround Failed Company Hosting Service	2005	Relational	—	SQL	—	Failed Company Hosting Service
	XTDB AI-Assisted	2018	Document / XML	—	SQL, Datalog	—	AI-Assisted
	XtremeData OLAP	2003	Relational	—	SQL	—	OLAP
	YARD-SQL Failed Company	1996	Relational	Supported	SQL	Supported	Failed Company
	YDB NewSQL OLTP AI-Assisted	2014	Relational	—	RPC, HTTP / REST, SQL	—	NewSQL OLTP AI-Assisted
	Yellowbrick OLAP	2014	Relational	Supported	SQL	Supported	OLAP
	YouTrackDB Forked Code AI-Assisted	2024	Graph	—	Custom API, SQL, Gremlin	—	Forked Code AI-Assisted
	YTsaurus AI-Assisted	2010	Key-Value	—	Command-line / Shell, Custom API, SQL	—	AI-Assisted
	YugabyteDB Forked Code OLTP AI-Assisted	2016	Key-Value, Relational	Supported	Custom API, PL/SQL	Supported	Forked Code OLTP AI-Assisted
	zeeSQL Cache OLTP	2021	Relational	—	SQL	—	Cache OLTP
	ZeptoDB Time-Series AI-Assisted	2026	—	—	Custom API, HTTP / REST, SQL	—	Time-Series AI-Assisted
	ZODB	2002	Object-Oriented	Not Supported	Custom API	Supported