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57 lines
2.2 KiB
HTML
57 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 records a sale of a product in a given year.
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A product may have multiple sales entries in the same year.
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Note that the per-unit price.
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</pre>
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<p>Write a solution to find all sales that occurred in the <strong data-end="967" data-start="953">first year</strong> each product was sold.</p>
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<ul data-end="1234" data-start="992">
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<li data-end="1078" data-start="992">
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<p data-end="1078" data-start="994">For each <code data-end="1015" data-start="1003">product_id</code>, identify the earliest <code data-end="1045" data-start="1039">year</code> it appears in the <code data-end="1071" data-start="1064">Sales</code> table.</p>
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</li>
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<li data-end="1140" data-start="1079">
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<p data-end="1140" data-start="1081">Return <strong data-end="1095" data-start="1088">all</strong> sales entries for that product in that year.</p>
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</li>
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</ul>
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<p data-end="1234" data-start="1143">Return a table with the following columns: <strong>product_id</strong>,<strong> first_year</strong>, <strong>quantity, </strong>and<strong> price</strong>.<br />
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Return the result in any order.</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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<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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