Mysql 如何使用group、Internal join和sum？

我有两张桌子：产品和销售

产品

id- productname  -  grp

11    bmwblue       bmw
12    bmwwhite      bmw
13    audiblack     audi
14    audiwhite     audi

 id   productid  amount

 1      11        2
 2      12        1
 x      13        5
 x      14        3

销售

id- productname  -  grp

11    bmwblue       bmw
12    bmwwhite      bmw
13    audiblack     audi
14    audiwhite     audi

 id   productid  amount

 1      11        2
 2      12        1
 x      13        5
 x      14        3

我怎样才能表现出来

奥迪8，宝马3

SELECT grp,
       sum(amount) AS total_grp_amount
FROM products AS p
JOIN sales AS s ON p.id = s.product_id
GROUP BY grp

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我想你在找这个。

你试过什么吗？