MySQL | Easy-Understanding | Beginner-Friendly
\nselect  sell_date,\n\t    count(distinct product) as num_sold,\n        group_concat(distinct product) as products\nfrom activities\ngroup by sell_date\norder
```\nselect  sell_date,\n\t    count(distinct product) as num_sold,\n        group_concat(distinct product) as products\nfrom activities\ngroup by sell_date\norder by sell_date\n```
['MySQL']