Hi,
Edit
You can use Azure data studio to explore the Oracle database. Check the below URL for more details.
You can also use copy activity in ADF / Synapse to connect to Oracle source and write the data to a file in azure storage or to an azure SQL table and use that file for further exploration. Or in case of synapse, you can write the data to a SQL pool table and use that as staging table for further transformation.
Hope that helps.