When I attempt to reconnect using a custom SQL and Tableau 8.2, I get an error message that asks if I want to edit the connection information:
Selecting Yes then opens the edit data screen, with the custom SQL shown in red. Within the red box, there is an edit icon -- clicking on that permits me to modify the custom SQL.
After opening the Custom SQL dialog, I then just changed the SQL to point to the correct new table.
Note: I did not change the connected server or db -- just the table/view references within the custom SQL.
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Thank you brad.earle.1 !
I was clicking on Edit Data Source... and it was not allowing me to edit the query. Instead, I clicked on extract data and it gave me the option to edit the query. Thank you for your help.