SQL for dummies! :)
\tselect p.product_id, product_name \n\tfrom product p, sales s\n\twhere p.product_id = s.product_id\n\tgroup by p.product_id\n\thaving min(s.sale_date)>= \'201
\tselect p.product_id, product_name \n\tfrom product p, sales s\n\twhere p.product_id = s.product_id\n\tgroup by p.product_id\n\thaving min(s.sale_date)>= \'2019-01-01\' and max(s.sale_date) <= \'2019-03-31\';
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