Easiest Solution ;)
\nSELECT\n    sell_date,\n    COUNT(DISTINCT product) num_sold,\n    GROUP_CONCAT(DISTINCT product) products\nFROM activities\nGROUP BY sell_date\nORDER BY sell
```\nSELECT\n    sell_date,\n    COUNT(DISTINCT product) num_sold,\n    GROUP_CONCAT(DISTINCT product) products\nFROM activities\nGROUP BY sell_date\nORDER BY sell_date\n```
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