VARNING:frågan kommer inte att hantera dubbletter av poster med det maximala COUNT
SELECT commodity, COUNT(commodity) `count`
FROM orders
GROUP BY commodity
ORDER BY `count` DESC
LIMIT 1
Men detta kommer,
SELECT commodity, COUNT(commodity) `count`
FROM orders
GROUP BY commodity
HAVING COUNT(commodity) =
(
SELECT MAX(`COUNT`)
FROM
(
SELECT COUNT(commodity) `count`
FROM orders
GROUP BY commodity
) s
)