99.84% faster
SELECT\n    sell_date, \n\tCOUNT(DISTINCT product) AS num_sold, \n\tGROUP_CONCAT(DISTINCT product ORDER BY product ASC) AS products\nFROM\n    Activities\nGROUP
SELECT\n    sell_date, \n\tCOUNT(DISTINCT product) AS num_sold, \n\tGROUP_CONCAT(DISTINCT product ORDER BY product ASC) AS products\nFROM\n    Activities\nGROUP BY 1\nORDER BY 1 ASC\n
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