HI team,
To learn adding External data sources as Connected System. i installed PostgreSQL locally in my system and host as localhost but when i try to conenct with localhost through connected system . I couldn't able to connect.
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I assume that you use the Community Edition. Correct? You cannot connect any local resources to that environment.
I used Appian Demo Platform
You cannot do that in the Community Edition.
OK. The name "localhost" always points to the machine that code is run on. In case of Appian, it is the Appian server.
https://www.youtube.com/watch?v=MDu6hWknk70
You would have to expose your database server to the internet, find that IP address and then you might be able to connect.
A warning here: Exposing services to the internet will make them being attacked almost immediately! Do not do this if you do not know what you are doing!
An alternative could be to get an account on one of the available database services and connect those.