simple not in solution
select product_id,product_name from Product where product_id not in(select product_id from Sales where sale_date < \'2019-01-01\' or sale_date>\'2019-03-31\')
select product_id,product_name from Product where product_id not in(select product_id from Sales where sale_date < \'2019-01-01\' or sale_date>\'2019-03-31\')
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