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1484-group-sold-products-by-the-date/README.md

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+<h2><a href="https://leetcode.com/problems/group-sold-products-by-the-date/">1484. Group Sold Products By The Date</a></h2><h3>Easy</h3><hr><div class="sql-schema-wrapper__3VBi"><a class="sql-schema-link__3cEg">SQL Schema<svg viewBox="0 0 24 24" width="1em" height="1em" class="icon__1Md2"><path fill-rule="evenodd" d="M10 6L8.59 7.41 13.17 12l-4.58 4.59L10 18l6-6z"></path></svg></a></div><div><p>Table <code>Activities</code>:</p>
+
+<pre>+-------------+---------+
+| Column Name | Type    |
++-------------+---------+
+| sell_date   | date    |
+| product     | varchar |
++-------------+---------+
+There is no primary key (column with unique values) for this table. It may contain duplicates.
+Each row of this table contains the product name and the date it was sold in a market.
+</pre>
+
+<p>&nbsp;</p>
+
+<p>Write a solution to find for each date the number of different products sold and their names.</p>
+
+<p>The sold products names for each date should be sorted lexicographically.</p>
+
+<p>Return the result table ordered by <code>sell_date</code>.</p>
+
+<p>The&nbsp;result format is in the following example.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<pre><strong>Input:</strong> 
+Activities table:
++------------+------------+
+| sell_date  | product     |
++------------+------------+
+| 2020-05-30 | Headphone  |
+| 2020-06-01 | Pencil     |
+| 2020-06-02 | Mask       |
+| 2020-05-30 | Basketball |
+| 2020-06-01 | Bible      |
+| 2020-06-02 | Mask       |
+| 2020-05-30 | T-Shirt    |
++------------+------------+
+<strong>Output:</strong> 
++------------+----------+------------------------------+
+| sell_date  | num_sold | products                     |
++------------+----------+------------------------------+
+| 2020-05-30 | 3        | Basketball,Headphone,T-shirt |
+| 2020-06-01 | 2        | Bible,Pencil                 |
+| 2020-06-02 | 1        | Mask                         |
++------------+----------+------------------------------+
+<strong>Explanation:</strong> 
+For 2020-05-30, Sold items were (Headphone, Basketball, T-shirt), we sort them lexicographically and separate them by a comma.
+For 2020-06-01, Sold items were (Pencil, Bible), we sort them lexicographically and separate them by a comma.
+For 2020-06-02, the Sold item is (Mask), we just return it.
+</pre>
+</div>