PostgreSQL Version Used by Tableau Server

There are three methods:

1) Follow the steps below to find the version of Postgres SQL Server you are using:

1. Log in to Tableau Server or create a remote connection.
2. Launch Task Manager.
3. Click the Details tab.
4. Right click one of the postgres.exe processes and select Properties. Click the Details tab.

See this forum post for an screenshot example. 

2) Use the following statement in custom SQL to display  the PostgreSQL version.
SELECT version();

3) Check the PG_VERSION file in the “data” folder on Tableau Server.