simple solution
SELECT sell_date, count(DISTINCT product) as num_sold, group_concat(DISTINCT product separator \',\') as products\nFROM Activities\nGROUP BY sell_date\nORDER BY
SELECT sell_date, count(DISTINCT product) as num_sold, group_concat(DISTINCT product separator \',\') as products\nFROM Activities\nGROUP BY sell_date\nORDER BY sell_date
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