1069. 产品销售分析

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题目

销售表：Sales

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+-------------+-------+
| Column Name | Type  |
+-------------+-------+
| sale_id     | int   |
| product_id  | int   |
| year        | int   |
| quantity    | int   |
| price       | int   |
+-------------+-------+
sale_id 是这个表的主键。
product_id 是 Product 表的外键。
请注意价格是每单位的。

产品表：Product

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+--------------+---------+
| Column Name  | Type    |
+--------------+---------+
| product_id   | int     |
| product_name | varchar |
+--------------+---------+
product_id 是这个表的主键。

编写一个 SQL 查询，按产品 id product_id 来统计每个产品的销售总量。

查询结果格式如下面例子所示:

示例1：

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Sales 表：
+---------+------------+------+----------+-------+
| sale_id | product_id | year | quantity | price |
+---------+------------+------+----------+-------+ 
| 1       | 100        | 2008 | 10       | 5000  |
| 2       | 100        | 2009 | 12       | 5000  |
| 7       | 200        | 2011 | 15       | 9000  |
+---------+------------+------+----------+-------+

Product 表：
+------------+--------------+
| product_id | product_name |
+------------+--------------+
| 100        | Nokia        |
| 200        | Apple        |
| 300        | Samsung      |
+------------+--------------+

Result 表：
+--------------+----------------+
| product_id   | total_quantity |
+--------------+----------------+
| 100          | 22             |
| 200          | 15             |
+--------------+----------------+

解法

解法一：

SQL

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# Write your MySQL query statement below
select product_id, sum(quantity) as total_quantity from Sales group by product_id
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