Sql 筛选行以仅获取最新值

我在表格中有以下数据：

ORDERID, PRODUCT,  QUANTITY
1,       potatoes, 10
1,       oranges,  20
2,       apples,   10
2,       oranges,  15
3,       pears,    20
3,       peaches,  12

我想查询该表以过滤掉重复的产品（例如橙子），只取最新的（更高的ORDERID）值。这将导致：

ORDERID, PRODUCT,  QUANTITY
1,       potatoes, 10
2,       apples,   10
2,       oranges,  15
3,       pears,    20
3,       peaches,  12

---

@Dudu给出的答案的另一种选择是子查询以查找每个产品的最大订单ID，然后将其连接回原始表以限制您要查看的记录

SELECT t1.ORDERID,
       t1.PRODUCT,
       t1.QUANTITY
FROM yourTable t1
INNER JOIN
(
    SELECT PRODUCT, MAX(ORDERID) AS MAX_ORDERID
    FROM yourTable
    GROUP BY PRODUCT
) t2
    ON t1.PRODUCT = t2.PRODUCT AND
       t1.ORDERID = t2.MAX_ORDERID

---

@Dudu给出的答案的另一种选择是子查询以查找每个产品的最大订单ID，然后将其连接回原始表以限制您要查看的记录

SELECT t1.ORDERID,
       t1.PRODUCT,
       t1.QUANTITY
FROM yourTable t1
INNER JOIN
(
    SELECT PRODUCT, MAX(ORDERID) AS MAX_ORDERID
    FROM yourTable
    GROUP BY PRODUCT
) t2
    ON t1.PRODUCT = t2.PRODUCT AND
       t1.ORDERID = t2.MAX_ORDERID