Easiest Mysql Solution
select \nproduct_id, product_name\nfrom product\nwhere product_id not in\n(select product_id\nfrom sales\nwhere sale_date <\'2019-01-01\'or sale_date>\'2019-03-
select \nproduct_id, product_name\nfrom product\nwhere product_id not in\n(select product_id\nfrom sales\nwhere sale_date <\'2019-01-01\'or sale_date>\'2019-03-31\')
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