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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>Initially, all products have price 10.</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>Write a solution to find the prices of all products on the date <code>2019-08-16</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>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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