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leetcode-cn/problem (English)/产品销售分析 III(English) [product-sales-analysis-iii].html
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@@ -12,32 +12,25 @@
+-------------+-------+
(sale_id, year) is the primary key (combination of columns with unique values) of this table.
product_id is a foreign key (reference column) to <code>Product</code> table.
Each row of this table shows a sale on the product product_id in a certain year.
Note that the price is per unit.
Each row records a sale of a product in a given year.
A product may have multiple sales entries in the same year.
Note that the per-unit price.
</pre>
<p>&nbsp;</p>
<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>
<p>Table: <code>Product</code></p>
<ul data-end="1234" data-start="992">
<li data-end="1078" data-start="992">
<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>
</li>
<li data-end="1140" data-start="1079">
<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>
</li>
</ul>
<pre>
+--------------+---------+
| Column Name | Type |
+--------------+---------+
| product_id | int |
| product_name | varchar |
+--------------+---------+
product_id is the primary key (column with unique values) of this table.
Each row of this table indicates the product name of each product.
</pre>
<p>&nbsp;</p>
<p>Write a solution to select&nbsp;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>
<p>Return the resulting table in <strong>any order</strong>.</p>
<p>The&nbsp;result format is in the following example.</p>
<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 />
Return the result in any order.</p>
<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
@@ -52,14 +45,7 @@ Sales table:
| 2 | 100 | 2009 | 12 | 5000 |
| 7 | 200 | 2011 | 15 | 9000 |
+---------+------------+------+----------+-------+
Product table:
+------------+--------------+
| product_id | product_name |
+------------+--------------+
| 100 | Nokia |
| 200 | Apple |
| 300 | Samsung |
+------------+--------------+
<strong>Output:</strong>
+------------+------------+----------+-------+
| product_id | first_year | quantity | price |