My table fields are...
cClass
cSku
cSupplier
cStyle
cCost
cRetail
nSalesQty

Table has 23 millions of records, then I need to create the best query. My query needs all fields in SELECT... a SUM on nSalesQty and GROUP BY cClass and cSku. My question is: how can I extract in the same query (or otherwise) all the rest of fields (cSupplier, cStyle, cCost, cRetail), because other fields are not aggregate. Do I need to use MAX(cSupplier), MAX(cStyle)... etc ? Or there is another way to do that? Don't forget my table is very huge.