Upgrade to Tableau Desktop 2020.4 to connect to PostgreSQL 12 using a JDBC driver that is installed with the product.
If you cannot upgrade to Tableau Desktop 2020.4, you can try the steps below:
Uninstall the current Postgresql driver, then install Postgresql ODBC driver version 12.
- The installer can be downloaded from this site https://www.postgresql.org/ftp/odbc/versions/msi/
Once the outdated version of Postgresql ODBC driver has been uninstalled, and the current Postgresql ODBC driver version 12 has been installed, Tableau Desktop will utilize Postgresql ODBC 12 to connect to your Postgresql database version 12.