MySQL Easy Solution.
Code\n\nSELECT \n  sell_date, \n  COUNT(DISTINCT(product)) AS num_sold, \n  GROUP_CONCAT(DISTINCT(product)) AS products\nFROM Activities\nGROUP BY sell_date\n\n
# Code\n```\nSELECT \n  sell_date, \n  COUNT(DISTINCT(product)) AS num_sold, \n  GROUP_CONCAT(DISTINCT(product)) AS products\nFROM Activities\nGROUP BY sell_date\n```\n![catty.png](https://assets.leetcode.com/users/images/00b619c4-a2b5-4df8-b722-4d15b667f177_1688727609.374941.png)\n
['MySQL']