mysql: command not found
The Oracle installer for MySQL puts the mysql binary in /usr/local/mysql/bin. You either need to call it with the full path:

/usr/local/mysql/bin/mysql


Or put /usr/local/mysql/bin in your PATH by adding the following to end of your ~/.bash_profile:

export PATH=/usr/local/mysql/bin:${PATH}


And then reloading your shell.

See my answer to this question for why I think you should install these things with Homebrew instead of dmg-based installers. Ultimately, it lets you manage what's in your PATH with less hassle.