SQL simple query
\n\n# Code\n\nSELECT\n  sell_date,\n  COUNT(DISTINCT product) AS num_sold,\n  GROUP_CONCAT(DISTINCT product ORDER BY product) AS products\nFROM Activities\nGROU
\n\n# Code\n```\nSELECT\n  sell_date,\n  COUNT(DISTINCT product) AS num_sold,\n  GROUP_CONCAT(DISTINCT product ORDER BY product) AS products\nFROM Activities\nGROUP BY sell_date\nORDER BY sell_date;\n\n```
['MySQL']