simple solution
\nSELECT sell_date, \nCOUNT(DISTINCT(product)) AS num_sold, \nGROUP_CONCAT(DISTINCT(product)) AS products \nFROM Activities \nGROUP BY sell_date \nORDER BY sell
```\nSELECT sell_date, \nCOUNT(DISTINCT(product)) AS num_sold, \nGROUP_CONCAT(DISTINCT(product)) AS products \nFROM Activities \nGROUP BY sell_date \nORDER BY sell_date;\n```
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