How to get the SQL for a data source

I have "inherited" a set of Tableau workbooks and dashboards. No documents around how the data sources are built. I am familiar with databases and tables but how the SQLs and/or logic behind the data sources.

In order to troubleshoot and answer questions I am getting how can I figure out the data source details (SQLs).

I saw some answers around looking at the log files after data source refresh etc but do not have access to the Tableau server.

Any input would be appreciated.

#sql #tableau