HyperSQL DataBase

HyperSQL DataBase (HSQLDB) is a lightweight, high-speed Java-based SQL database engine celebrated for its compliance with the latest SQL standards, including SQL:2023. Suitable for embedded or server deployment, it supports in-memory and disk-based tables, making it versatile for small to large scale applications. Its main appeal lies in the extensive feature set, such as support for modern SQL functionalities, complex predicates, interval types, and transactional operations—all packaged within a compact footprint. Designed primarily for developers, it offers straightforward command-line and GUI tools that simplify database management and querying. HSQLDB seamlessly integrates with popular office suites like [OpenOffice.org](http://OpenOffice.org) and LibreOffice, and is accessible through Maven repositories for easy Java project inclusion. Its compatibility with ANSI-92 SQL and adaptable syntax modes enable smooth operation across different database systems, assuring developers of smooth interoperability. The database's architecture supports multi-threading for high-speed concurrency, making it suitable for multi-user web and desktop applications. It also supports both in-memory speeds, ideal for testing and transient sessions, and durable disk storage for long-term data persistence.