title: MySQL unrepeatable rows search query
body: <p><br>
  I save some images in my database. Each images have a "tags" property.<br>
  I'm gonna show "search by tags" result to users, but there is a problem.<br>For example, "<strong>IMAGE1</strong>" has "c#, programming, scripting" tags and I'm gonna show every images which have "programming" and "scripting" tags. So If I do that, "<strong>IMAGE1</strong>" will be duplicated.<br></p>
  
  <p>So how can I prevent this duplicating ?!
  Thanks !!</p>