Formatted question description: https://leetcode.ca/all/1084.html

1084. Sales Analysis III

Level

Easy

Description

Table: Product

+--------------+---------+
| Column Name  | Type    |
+--------------+---------+
| product_id   | int     |
| product_name | varchar |
| unit_price   | int     |
+--------------+---------+
product_id is the primary key of this table.

Table: Sales

+-------------+---------+
| Column Name | Type    |
+-------------+---------+
| seller_id   | int     |
| product_id  | int     |
| buyer_id    | int     |
| sale_date   | date    |
| quantity    | int     |
| price       | int     |
+------ ------+---------+
This table has no primary key, it can have repeated rows.
product_id is a foreign key to Product table.

Write an SQL query that reports the products that were only sold in spring 2019. That is, between 2019-01-01 and 2019-03-31 inclusive.

The query result format is in the following example:

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           |
+-------------+--------------+
The product with id 1 was only sold in spring 2019 while the other two were sold after.

Solution

Join the tables Sales and Product and select Product.product_id, product_name. Use group by product_id and use having min(sale_date) >= '2019-01-01' and max(sale_date) <= '2019-03-31' to only select the products sold in the determined period.

# Write your MySQL query statement below
select Product.product_id, product_name
from Product left join Sales
on Product.product_id = Sales.product_id
group by product_id
having min(sale_date) >= '2019-01-01' and max(sale_date) <= '2019-03-31';
(
    SELECT DISTINCT s.product_id, p.product_name
    FROM Sales s LEFT JOIN Product p ON
        s.product_id = p.product_id
    WHERE s.sale_date >= '2019-01-01' AND
          s.sale_date <= '2019-03-31'
)
EXCEPT -- MINUS if Oracle
(
    SELECT DISTINCT s.product_id, p.product_name
    FROM Sales s LEFT JOIN Product p ON
        s.product_id = p.product_id
    WHERE s.sale_date < '2019-01-01' OR
          s.sale_date > '2019-03-31'
)

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