How do I select the longest 'string' from a table when grouping

Question

Example:

SELECT partnumber, manufacturer, condition, SUM(qty), AVG(price), description FROM parts

WHERE [something]

GROUP BY partnumber, manufacturer, cond         


        

Answer 1

SELECT   partnumber, manufacturer, `condition`, SUM(qty), AVG(price), description
FROM     parts
WHERE    [something] AND LENGTH(description) = (
           SELECT MAX(LENGTH(description))
           FROM   parts AS p
           WHERE  p.partnumber   = parts.partnumber
              AND p.manufacturer = parts.manufacturer
              AND p.condition    = parts.condition
         )
GROUP BY partnumber, manufacturer, `condition`