| # | Title | Solutions | Video | Difficulty | Tag

|-----|----------------|---------------|---------------|---------------|-------------

|1607|[Sellers With No Sales](https://leetcode.com/problems/sellers-with-no-sales/)|[Solution](../master/database/_1607.sql)|| Easy|

|1543|[Fix Product Name Format](https://leetcode.com/problems/fix-product-name-format/)|[Solution](../master/database/_1543.sql)|| Easy|

|1517|[Find Users With Valid E-Mails](https://leetcode.com/problems/find-users-with-valid-e-mails/)|[Solution](../master/database/_1517.sql)|| Easy|

|1495|[Friendly Movies Streamed Last Month](https://leetcode.com/problems/friendly-movies-streamed-last-month/)|[Solution](../master/database/_1495.sql)|| Easy|

select seller_namefrom Selleras SELLER_NAMEwhere seller_id notin (

select distinct(seller_id)from Orderswhere sale_date between'2020-01-01'and'2020-12-31'

)order by seller_name;