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# 1484. Group Sold Products By The Date

<https://leetcode.com/problems/group-sold-products-by-the-date>

## Description

Table `Activities`:

```
+-------------+---------+
| Column Name | Type    |
+-------------+---------+
| sell\_date   | date    |
| product     | varchar |
+-------------+---------+
There is no primary key for this table, it may contains duplicates.
Each row of this table contains the product name and the date it was sold in a market.
```

Write an SQL query to find for each date, the number of distinct products sold and their names.

The sold-products names for each date should be sorted lexicographically.&#x20;

Return the result table ordered by `sell_date`.

The query result format is in the following example.

```
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     |
+------------+-------------+
Result table:
+------------+----------+------------------------------+
| sell\_date  | num\_sold | products                     |
+------------+----------+------------------------------+
| 2020-05-30 | 3        | Basketball,Headphone,T-shirt |
| 2020-06-01 | 2        | Bible,Pencil                 |
| 2020-06-02 | 1        | Mask                         |
+------------+----------+------------------------------+
For 2020-05-30, Sold items were (Headphone, Basketball, T-shirt), we sort them lexicographically and separate them by comma.
For 2020-06-01, Sold items were (Pencil, Bible), we sort them lexicographically and separate them by comma.
For 2020-06-02, Sold item is (Mask), we just return it.
```

## ac

```java
```