Multiple Versions of PostgreSQL®
If you have multiple versions of PostgreSQL®, note that the installation order impacts the order of the versions. The environment variables must contain the path to the wincc_oa_dir/bin/pgsql directory to make sure that the right version PostgreSQL® V13) is used.
To check the client version, use the following command in the command prompt:
psql --version
For the server version call the SQL query:
SELECT version();