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47 lines
1.4 KiB
HTML
47 lines
1.4 KiB
HTML
<p>Table: <code>Products</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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| new_price | int |
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| change_date | date |
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+---------------+---------+
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(product_id, change_date) is the primary key (combination of columns with unique values) of this table.
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Each row of this table indicates that the price of some product was changed to a new price at some date.</pre>
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<p> </p>
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<p>Write a solution to find the prices of all products on <code>2019-08-16</code>. Assume the price of all products before any change is <code>10</code>.</p>
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<p>Return the result 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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Products table:
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+------------+-----------+-------------+
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| product_id | new_price | change_date |
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+------------+-----------+-------------+
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| 1 | 20 | 2019-08-14 |
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| 2 | 50 | 2019-08-14 |
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| 1 | 30 | 2019-08-15 |
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| 1 | 35 | 2019-08-16 |
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| 2 | 65 | 2019-08-17 |
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| 3 | 20 | 2019-08-18 |
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+------------+-----------+-------------+
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<strong>Output:</strong>
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+------------+-------+
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| product_id | price |
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+------------+-------+
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| 2 | 50 |
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| 1 | 35 |
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| 3 | 10 |
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+------------+-------+
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</pre>
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