销售分析III

Posted 2022-11-11

题目描述：

Table: Product
+--------------+---------+
 | Column Name  | Type    |
 +--------------+---------+
 | product_id   | int     |
 | product_name | varchar |
 | unit_price   | int     |
 +--------------+---------+
 product_id 是这个表的主键
 Table: Sales+-------------+---------+
 | Column Name | Type    |
 +-------------+---------+
 | seller_id   | int     |
 | product_id  | int     |
 | buyer_id    | int     |
 | sale_date   | date    |
 | quantity    | int     |
 | price       | int     |
 +------ ------+---------+
 这个表没有主键，它可以有重复的行.
 product_id 是 Product 表的外键.

 

编写一个SQL查询，报告2019年春季才售出的产品。即仅在2019-01-01至2019-03-31（含）之间出售的商品。

查询结果格式如下所示：

Product table:
 +------------+--------------+------------+
 | product_id | product_name | unit_price |
 +------------+--------------+------------+
 | 1          | S8           | 1000       |
 | 2          | G4           | 800        |
 | 3          | iPhone       | 1400       |
 +------------+--------------+------------+Sales table:
 +-----------+------------+----------+------------+----------+-------+
 | seller_id | product_id | buyer_id | sale_date  | quantity | price |
 +-----------+------------+----------+------------+----------+-------+
 | 1         | 1          | 1        | 2019-01-21 | 2        | 2000  |
 | 1         | 2          | 2        | 2019-02-17 | 1        | 800   |
 | 2         | 2          | 3        | 2019-06-02 | 1        | 800   |
 | 3         | 3          | 4        | 2019-05-13 | 2        | 2800  |
 +-----------+------------+----------+------------+----------+-------+Result table:
 +-------------+--------------+
 | product_id  | product_name |
 +-------------+--------------+
 | 1           | S8           |
 +-------------+--------------+
 id为1的产品仅在2019年春季销售，其他两个产品在之后销售。

 

解题思路：

个人愚见，标准答案错误，正常在2019-01-01至2019-03-31的时间范围，应该是2条数据

俩表连接，日期范围

SELECT s.product_id , p.product_name
FROM product p 
JOIN sales s
ON p.product_id = s.product_id
WHERE s.sale_date >= 2019-01-01 AND s.sale_date <= 2019-03-31
GROUP BY s.product_id