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71 lines
2.2 KiB
HTML
71 lines
2.2 KiB
HTML
<p>Table: <code>Sales</code></p>
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<pre>
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+-------------+-------+
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| Column Name | Type |
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+-------------+-------+
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| sale_id | int |
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| product_id | int |
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| year | int |
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| quantity | int |
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| price | int |
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+-------------+-------+
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(sale_id, year) is the primary key (combination of columns with unique values) of this table.
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product_id is a foreign key (reference column) to <code>Product</code> table.
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Each row of this table shows a sale on the product product_id in a certain year.
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Note that the price is per unit.
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</pre>
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<p> </p>
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<p>Table: <code>Product</code></p>
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<pre>
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+--------------+---------+
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| Column Name | Type |
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+--------------+---------+
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| product_id | int |
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| product_name | varchar |
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+--------------+---------+
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product_id is the primary key (column with unique values) of this table.
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Each row of this table indicates the product name of each product.
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</pre>
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<p> </p>
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<p>Write a solution to select the <strong>product id</strong>, <strong>year</strong>, <strong>quantity</strong>, and <strong>price</strong> for the <strong>first year</strong> of every product sold.</p>
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<p>Return the resulting table in <strong>any order</strong>.</p>
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<p>The result format is in the following example.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input:</strong>
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Sales table:
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+---------+------------+------+----------+-------+
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| sale_id | product_id | year | quantity | price |
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+---------+------------+------+----------+-------+
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| 1 | 100 | 2008 | 10 | 5000 |
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| 2 | 100 | 2009 | 12 | 5000 |
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| 7 | 200 | 2011 | 15 | 9000 |
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+---------+------------+------+----------+-------+
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Product table:
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+------------+--------------+
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| product_id | product_name |
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+------------+--------------+
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| 100 | Nokia |
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| 200 | Apple |
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| 300 | Samsung |
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+------------+--------------+
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<strong>Output:</strong>
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+------------+------------+----------+-------+
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| product_id | first_year | quantity | price |
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+------------+------------+----------+-------+
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| 100 | 2008 | 10 | 5000 |
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| 200 | 2011 | 15 | 9000 |
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+------------+------------+----------+-------+
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</pre>
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