Can anyone help me with Connection String Syntax for ODBC connecting via the Execute SQL function?
Do I need to have ODBC Drivers installed on my SharePoint 2013 Farm? And if so where to find instructions on this.
yes you need to have the ODBC drivers but since Windows Server 2003 it is normally included by default. See these threads for information about connection strings:
Execute SQL Actions
Issue with Execute SQL and workflow constant for connection string
Retrieving data ...