>>It'll give you MIN(Numero) for each group but the rest of the fields in the record, that are not in group by clause, will come from the last physical record in the group which may or may not be the record with MIN(Numero).
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>Don't forget that VFP8 will not allow queries like this. Everything that is not an aggregate field (SUM(), TOP(), etc.) that is in the SELECT clause must be included in the GROUP BY clause.

I would say "VFP8 will not allow queries like this by default" because it can be changed by using new SET ENGINEBEHAVIOR command or SYS(3099) function. However I would recomend to stick with new VFP8 database engine behavior because it's compatible with other backends like MS SQL Server, Oracle e.t.c. and queries will always produce correct result regardless of physical order of data in the source tables.