Take time and read the available documentation over, and over, and over again. Getting your head around database manipulation isn't something you can do overnight, especially starting from scratch. My advice is to learn 'databases' more widely first before even thinking about the specifics of queries (SELECT/INSERT...). Learn what a database actually is, how and why data is stored in various ways, from a very wide angle approach. Learn the subject of "databases" rather than "MySQL". I know this really isn't much practical help to you at all but I'm not so much a fan of the "use this code, it'll work" approach.

Perhaps a good book or two on the subject (whether printed or digital) might help to understand the subject. They often provide a wider textual description then throw in a little bit of code to relate theory with practice. For learning, things like books and articles might provide easier understanding than the specific documentation because the latter can often appear to be just a jumble of babble if you're not clear on the terminology.