Hello, It turns out the groupBy attribute references a property in the resultMap, not a column.
Doh! It'd be nice if the iBATIS DataMapper PDF mentioned that on page 29 and used different names in the example on page 28 (rather than 'quarter' for everything). I'd be willing to put together a FAQ item with an working example of groupBy hitting two tables via a join if anyone thinks that's useful. Cheers, topher
