Question

I have a table Sales with the following fields: code, amount, index, name.

I need to get the smallest and the largest amount for a given name, and the code for which the amount is the smallest and largest.

Can somebody help me in constructing a query?

Answer 1

To find min and max amount per name:

select
   name
   min(amount), max(amount)
from
  sales
group by name

and to get both(min and max) and code in single query:

select *
from sales s
where 
       (amount = (select
                   max(s1.amount)
                 from sales s1
                 where  s1.name = s.name)
        or
        amount = (select
                   min(s2.amount)
                 from sales s2
                 where  s2.name = s.name)
       )