Can u please suggest me a best sql connector to access eloqua database

Hi folks!

I am in need of writing queries to join two or more cdo tables to retrive data - as we have limitations in eloqua that we cant directly use sql queries like salesforce to retrive them , i am looking for an online cloud app/ webservice or an apps inside oracle which we can connect with eloqua database to retrive data using sql queries.

Any inputs or leads on above is appreciated!

thanks