[Hsqldb-developers] custom aggregate function

[Stephen Ince]

Title: HSQLDB Help Needed

Hi,    I would like to write a stddev function for hqldb. I see that it is possible to write a custom function for a single value. What about a custom aggregate function?  I did look at http://hsqldb.sourceforge.net/doc/guide/ch08.html#stored-section.   Example usage. select stddev(salary) from employee.       Steve