hsqldb
is a relational database engine written in Java, with a JDBC
driver, supporting a rich subset of ANSI-92 SQL (BNF tree
format).
It offers a small (less than 160k), fast database
engine which offers both in memory and disk based tables.
Embedded and server modes are available. Additionally, it
includes tools such as a minimal web server, in-memory query
and management tools (can be run as applets) and a number
of demonstration examples.
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