I am totally in agreement with Skemcin.You don't need to know PHP and Mysql.It does depend on what area or what your focus is. Personally I am a designer. I design mock ups, the graphic side and code some HTML and PHP. But I am extremely good at HTMl and CSS but like I said I am more of a designer. Which is fine.As more of a designer - I have a couple of options. One is to work with a bigger company who has a complete development team. Or to do many small business websites. And I do both. I have a company which I am employ a dev. team, which enables me to work on the look and feel of websites more. I can either stick to creating HTML and CSS based websites or when we are creating a huge database driven websites - I work with my team. I also am deeply involved in SEO for the smaller business.Good Luck on being a designer