MySQL solution | |   Easy solution
\n# Code\n\nselect product_id,product_name \nfrom Product where product_id not \nin \n(\n    select p.product_id from Product p left join Sales s \n    on p.pro
\n# Code\n```\nselect product_id,product_name \nfrom Product where product_id not \nin \n(\n    select p.product_id from Product p left join Sales s \n    on p.product_id=s.product_id \n    where s.sale_date <date(\'2019-01-01\') \n    or\n    s.sale_date >date(\'2019-03-31\') \n    or\n    s.seller_id is null \n);\n```
['MySQL']