If, after installing PostgreSQL, you face “psql not recognized as an internal or external command” error when you try to run psql from command prompt, then most probably all you need to do to solve this problem is to add the Postgres’s bin directory to the PATH system variable (the PATH is a system variable which allows Windows with the help of the Command prompt or the Terminal window find executables).
On this page of the site you can watch the video online Setting Windows PATH for PSQL Postgres tools with a duration of hours minute second in good quality, which was uploaded by the user Shakeel ur Rehman 20 December 2020, share the link with friends and acquaintances, this video has already been watched 14,664 times on youtube and it was liked by 187 viewers. Enjoy your viewing!