Simple MSSQL Solution
\nselect product_id, product_name\nfrom product \nwhere product_id not in(select product_id from sales where sale_date<\'2019-01-01\' or sale_date>\'2019-03-31\
```\nselect product_id, product_name\nfrom product \nwhere product_id not in(select product_id from sales where sale_date<\'2019-01-01\' or sale_date>\'2019-03-31\')\n```
['MS SQL Server']