Check out example codes for "add mysql to path". It will help you in understanding the concepts better.

Code Example 1

For windows users only!
I had a lot of trouble for this one, but I found the solution.
Visit this page: https://overiq.com/installing-mysql-windows-linux-and-mac/

And then follow the steps, but instead of putting this:
C:\Program Files\MySQL\MySQL Server x.y\bin\mysql.exe

Put this:
C:\Program Files\MySQL\MySQL Server x.y\bin

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