MS-Access -> SELECT AS + ORDER BY = error

Question

I\'m trying to make a query to retrieve the region which got the most sales for sweet products. \'grupo_produto\' is the product type, and \'regiao\' is the region. So I got

Answer 1

Why it doesn't consider the newly created 'column' I made in the select clause?

Because Access (ACE/Jet) is not compliant with the SQL-92 Standard.

Consider this example, which is valid SQL-92:

SELECT a AS x, c - b AS y
  FROM MyTable
 ORDER
    BY x, y;

In fact, x and y the only valid elements in the ORDER BY clause because all others are out of scope (ordinal numbers of columns in the SELECT clause are valid though their use id deprecated).

However, Access chokes on the above syntax. The equivalent Access syntax is this:

SELECT a AS x, c - b AS y
  FROM MyTable
 ORDER
    BY a, c - b;

However, I understand from @Remou's comments that a subquery in the ORDER BY clause is invalid in Access.