MySQL using COUNT, GROUP_CONTACT
\nselect sell_date, count(distinct product) num_sold, \ngroup_concat(distinct product order by product) \nproducts from Activities group by sell_date;\n
```\nselect sell_date, count(distinct product) num_sold, \ngroup_concat(distinct product order by product) \nproducts from Activities group by sell_date;\n```
['MySQL']