I have installed Postgresql on my Windows 10 PC. I have used the pgAdmin II tool to create a database called company, and now I want to start the database server running. I
If you are getting an error "psql.exe' is not recognized as an internal or external command,... "
There can be : Causes
or - PostgreSQL Database client not installed on your PC
Since you have already installed PostgreSQL the latter can not be the issue(assuming everything is installed as expected)
In order to fix the first one "please specify the full path to the bin directory in the PostgreSQL installation folder, where this tool resides."
For example
Path: "C:\Program Files\PostgreSQL\10\bin"