This is the result i get from a simple select like this:

legacy_db(legacy_db.cursodado.gp_pro_id==course).select()

cursodado.gp_id cursodado.gp_pro_id cursodado.gp_historicdate 
cursodado.gp_curso_id 

10003600042014-01-27 16:02:10None


10003600042014-01-27 17:18:31None


10003600042014-01-27 17:21:02None


10005250042014-01-27 16:02:10None


10005250042014-01-27 17:18:31None


10005250042014-01-27 17:21:02None









Here i get the id of the person and the id of the course but I want only to 
show the first I once, that correspond to the max(cursodado.gp_historicdate)
To see it like this:

cursodado.gp_id cursodado.gp_pro_id cursodado.gp_historicdate 
cursodado.gp_curso_id 








10003600042014-01-27 17:21:02None








10005250042014-01-27 17:21:02None

tried this in the select but it gives a timeout:

select(groupby=gp_id,having=max(historicdate field))

Thanks!

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