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leetcode/problem/sales-analysis-iii.html

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+<p>Table: <code>Product</code></p>
+
+<pre>
++--------------+---------+
+| Column Name  | Type    |
++--------------+---------+
+| product_id   | int     |
+| product_name | varchar |
+| unit_price   | int     |
++--------------+---------+
+product_id is the primary key of this table.
+Each row of this table indicates the name and the price of each product.
+</pre>
+
+<p>Table: <code>Sales</code></p>
+
+<pre>
++-------------+---------+
+| 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 the Product table.
+Each row of this table contains some information about one sale.
+</pre>
+
+<p>&nbsp;</p>
+
+<p>Write an SQL query that reports the <strong>products</strong> that were <strong>only</strong> sold in the spring of <code>2019</code>. That is, between <code>2019-01-01</code> and <code>2019-03-31</code> inclusive.</p>
+
+<p>Return the result table in <strong>any order</strong>.</p>
+
+<p>The query result format is in the following example.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> 
+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  |
++-----------+------------+----------+------------+----------+-------+
+<strong>Output:</strong> 
++-------------+--------------+
+| product_id  | product_name |
++-------------+--------------+
+| 1           | S8           |
++-------------+--------------+
+<strong>Explanation:</strong> 
+The product with id 1 was only sold in the spring of 2019.
+The product with id 2 was sold in the spring of 2019 but was also sold after the spring of 2019.
+The product with id 3 was sold after spring 2019.
+We return only product 1 as it is the product that was only sold in the spring of 2019.
+</pre>