Any of these RDBMS support the SQL standard statistics functions STDDEV_POP, STDDEV_SAMP, VAR_POP, VAR_SAMP:
- DB2 (only STDDEV, VARIANE)
- SQL Server (named STDEVP, STDEV, VARP, VAR)
- Sybase ASE
- Sybase SQL Anywhere
This would be a useful addition for Derby, I think.
An even larger example list of possible statistics aggregate functions is listed in the Postgres documentation: