mysql 分组总和求最大值 的两种方式

SELECT
	max(pp.totalPrice)
FROM
	(
		SELECT
			sum(oi.product_price) totalPrice
		FROM
			`order.item` oi
		GROUP BY
			oi.id
	) as pp

SELECT
	oi.id,
  oi.
	sum(oi.product_price) AS pp
FROM
	`order.item` oi
GROUP BY
	oi.id
order by pp desc limit 1