Question: If so where can I find the installation?

Answer: 
no, it isn’t—only on server version:

<http://developer.apple.com/internet/opensource/osdb.html>
If you follow [these instructions](http://hivelogic.com/articles/compiling-mysql-on-snow-leopard/), you can install MySQL by hand on Snow Leopard. (There are versions of the instructions for Leopard accessible on the site as well). It also contains instructions for registering MySQL with `launchd`, allowing you to just forget about it (it will be running if your computer is running), and also turn it off when you need to do so.