I may not be a professional, but I've been coding with PHP for a few years and MySQL integration was a must from the start. My site is developed solely around a MySQL back-end. Hardly anything in the site is static. I have also developed a few sites for various clans...
You can also find me in the Marketplace helping other people out and in this forum too (although the code I post isn't tested). The code I write I debug and test a lot to eliminate any errors that surface.