Easy MySQL Solution
\nselect sell_date, count(distinct product) as num_sold , \ngroup_concat(distinct product order by product asc separator \',\') as products               \nfrom
```\nselect sell_date, count(distinct product) as num_sold , \ngroup_concat(distinct product order by product asc separator \',\') as products               \nfrom activities  \ngroup by sell_date\norder by sell_date\n```
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