Open Source Database Feature Comparison Matrix

Apache Derby 10.1

MySQL 5.0

PostgreSQL 8.1

One$DB 4.0

General

Database Connections

Multiple

Concurrent Access to Multiple Databases

Multi-version Concurrency Control

Unicode Support

Replication Support

License

Apache (BSD)

GPL

BSD

LPGL

Specifications

SQL 99

ODBC

Relational Database Features

Sequences/Auto-increment Column

User Defined Functions

Update-capable Views

Referential Integrity

Triggers	Statement / Row Level
	Before / After
	Nesting
	Compound

Domains

BLOB

CLOB

Name Length Limit

128

Delimited Identifiers

Stored Procedures

Procedural Languages

PL/SQL (or equivalent)

Java

Python

Perl

PHP

Ruby

Key to Symbols
?	Feature supported
X	Feature not supported
*	External or unofficial support

Apache Derby 10.1

MySQL 5.0

PostgreSQL 8.1

One$DB 4.0

DQL

Joins

Subqueries

Nested Queries

Correlated Subqueries

Query in FROM Clause

Multi-column Predicate

Expression Support	Group By
	Order By

Union (Distinct/All)

Intersection (Distinct/All)

Except (Distinct/All)

Full Text Search

Java/JDBC

J2EE Certified

Database Metadata Imported/Exported Keys/CrossRefs

ResultSet GetAutoGeneratedKeys

Native Language Support

C/C++

C#/.Net

PHP

Perl

Python

Ruby

Key to Symbols
?	Feature supported
X	Feature not supported
*	External or Unofficial support

?	Apache Derby 10.1	MySQL 5.0	PostgreSQL 8.1	One$DB 4.0
Security	?	?	?	?
Users	?	?	?	?
Role	X	X	?	?
Privilege	X	?	?	?
Encryption	?	?	?	X
Database Administration Tools	?	?	?	?
Tools	IJ Scripting Tool, Cloudview, Import/Export	WinMySQL Admin, MySQL Administrator, MySQL Query Browser Command Shell	PgAdmin, psql, phpPgAdmin	Shell, Browser, Shell Server, Browser Server, Server
Hot Backup	?	*	?	X?
Table Spaces	X	?	?	X?
Point in Time recovery	X	*	?	X?
Table partitioning	X	X	?	X?
Graphical Interface	?	?	?	?
Creating Database Objects	*	?	?	??
Manipulate Data in Database Objects	*	?	?	??
Viewing Properties of Various Database Objects	*	?	?	??
Graphical Interface to Execute SQL Queries	*	?	?	??
Support for Executing Multiple Queries Simultaneously	*	?	?	??

Key to Symbols
?	Feature supported
X	Feature not supported
*	External or unofficial support

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