Using SQL date functions to get totals for last three days

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This is actually pretty straightforward.

SELECT product
     , datesold
     , SUM(quantity) AS total
  FROM orders
 WHERE datesold IN
        ( CURRENT_DATE - INTERVAL '2' DAY
        , CURRENT_DATE - INTERVAL '1' DAY
        , CURRENT_DATE )
GROUP
    BY product
     , datesold

This assumes, of course, that datesold is a DATE datatype column (and not DATETIME). The exact syntax supported by your particular database system might be slightly different from the above, which is standard SQL. Look in your SQL reference manual under Date Functions.