simple readable group by solution
\n# Write your MySQL query statement below\nselect sell_date, count(distinct product) num_sold, \ngroup_concat(distinct product) as products from Activities gro
```\n# Write your MySQL query statement below\nselect sell_date, count(distinct product) num_sold, \ngroup_concat(distinct product) as products from Activities group by sell_date\n```
['MySQL']