> For the complete documentation index, see [llms.txt](https://docs.chartsql.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.chartsql.com/chartsql-studio/datasources/hypersql.md).

# HyperSQL

## HyperSQL Overview

HyperSQL (HSQL, HSQLDB) is a Java Embedded RDBMS. ChartSQL uses a HSQL database to execute the example charts provided with the editor. You can also connect to other HSQLDB's as a local analytical database.