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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'
)