I couldn't find a location on w3schools to download the database, so I googled it. I found that user AndrejPHP created a query to create the database in SQL, however ...
Some sample querying to highlight how to use SQL from the w3schools online database.
一部の結果でアクセス不可の可能性があるため、非表示になっています。
アクセス不可の結果を表示する