fetching minimum/maximum any organisation activerecord

this an age-old doubt where given list attributes 'type', 'variety' 'price', fetch record smallest cost any form there is.

in sql, by:

select f.type, f.variety, f.price   
from (  name type, min(price) minprice list organisation form ) x  
inner join list f f.type = x.type f.price = x.minprice;`

we maybe embrace by:

minprices = table.minimum(:price, :group => type)  
result = []
minprices.each_pair |t, p|  
   outcome << table.find(:first, :conditions => ["type = ? cost = ?", t, p])
end

is there improved doing this?