Oracle and MySQL are similar. Oracle is not used in web, is transactional database, suitable for large company, financial instructions etc... MySQL is fast database, suitable for web sites.

SQL commands are slightly different from PL/SQL used by oracle. But studying MySQL commands are easy if you know Oracle SQL commands.

You started studying PHP ? If there is interest, we can start a PHP Tutorial thread, where all members with PHP knowledge can post some useful tips, that will make PHP easy to study.

We have a PHP Tutorial site, but it is not complete

http://phptutorial.bizhat.com