MySQL Solution, CLEAN, FASTER than 92 %
please UPVOTE \n\nSELECT  \n\tsell_date,\n\t(COUNT(sell_date ) ) as num_sold ,\n\tGROUP_CONCAT(distinct product  ORDER BY product) as products \nFROM \n\t(SELEC
* ***please UPVOTE ***\n```\nSELECT  \n\tsell_date,\n\t(COUNT(sell_date ) ) as num_sold ,\n\tGROUP_CONCAT(distinct product  ORDER BY product) as products \nFROM \n\t(SELECT DISTINCT sell_date,product FROM Activities) as Activities\nGROUP BY sell_date;\n```\n\n* ***please UPVOTE ***\n\n
['MySQL']