leecode 数据库：1084. 销售分析III

news2024/11/26 4:43:39

导入数据：

Create table If Not Exists Product (product_id int, product_name varchar(10), unit_price int);
Create table If Not Exists Sales (seller_id int, product_id int, buyer_id int, sale_date date, quantity int, price int);
Truncate table Product;
insert into Product (product_id, product_name, unit_price) values ('1', 'S8', '1000');
insert into Product (product_id, product_name, unit_price) values ('2', 'G4', '800');
insert into Product (product_id, product_name, unit_price) values ('3', 'iPhone', '1400');
Truncate table Sales;
insert into Sales (seller_id, product_id, buyer_id, sale_date, quantity, price) values ('1', '1', '1', '2019-01-21', '2', '2000');
insert into Sales (seller_id, product_id, buyer_id, sale_date, quantity, price) values ('1', '2', '2', '2019-02-17', '1', '800');
insert into Sales (seller_id, product_id, buyer_id, sale_date, quantity, price) values ('2', '2', '3', '2019-06-02', '1', '800');
insert into Sales (seller_id, product_id, buyer_id, sale_date, quantity, price) values ('3', '3', '4', '2019-05-13', '2', '2800');

Table: Product

+---------------+-----------+ | Column Name | Type | +---------------+-----------+ | product_id | int | | product_name | varchar | | unit_price | int | +---------------+-----------+ Product_id是该表的主键。该表的每一行显示每个产品的名称和价格。

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。该表的每一行包含关于一个销售的一些信息。

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。

以任意顺序返回结果表。

查询结果格式如下所示。

示例 1:

输入：
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 |
+-----------+---------------+------------+----------------+----------+--------+
输出：
+---------------+--------------------+
| product_id | product_name |
+---------------+--------------------+
| 1 | S8 |
+---------------+---------------------+
解释:
id为1的产品仅在2019年春季销售。
id为2的产品在2019年春季销售，但也在2019年春季之后销售。
id 3的产品在2019年春季之后销售。
我们只退回产品1，因为它是2019年春季才销售的产品。

解题思路

筛选在合法日期里面和不在合法日期里面,用distinct去重

#在合法日期里面
select distinct product_id
from Sales
where sale_date between '2019-01-01' and '2019-03-31'

#不在合法日期里面
select distinct product_id
from Sales
where sale_date not between '2019-01-01' and '2019-03-31'

用 not in 筛选出合法日期id不在非法日期表当中,再与Product表联查

代码：

select t.product_id,product_name
from (
    select distinct product_id
    from Sales
    where sale_date between '2019-01-01' and '2019-03-31'
    and product_id not in (
        select distinct product_id
        from Sales
        where sale_date not between '2019-01-01' and '2019-03-31'
    )
) t,Product p
where t.product_id = p.product_id;

执行结果