I just started a new web developer / programmer job. this job is going to require some really heavy MySQL development. I've done a lot of work with designing and creating databases using MySQL, php and various scripting languages. I've done some really complex backend development, but I've never had to merge MySQL dbs at all. and I don't even know where to start. I know that I will be required to do a lot of db merging in the near future with my new job. can anyone point me in the right direction as far a learning material. preferably free web sites or free stuff.