we can publish workbook to tableau online.
it will not automatically upload any data sources. You can manually add new data source.
When we say creator then you need to buy the tableau desktop and create the dashboards and publish to online.
Refer pricing and online details
Tableau Online supports live connections to:
- Google BigQuery, Amazon Redshift data, or SQL-based data hosted on a cloud platform; for example, Amazon RDS, Microsoft SQL Azure, or similar service.For direct connections to cloud data, you usually need to add Tableau Online to your data provider’s authorized list.
- On-premises relational data, such as SQL Server or Oracle, when you use Tableau Bridge to maintain the connection.