Your Biggest Data Model Complaints

I've been working with databases for a long time and there are no shortage of things I've seen other people do that I don't like. Sometimes I shake my head a little. Sometimes I might groan inwardly (hopefully not aloud), and sometimes I might make an effort to convince someone else to do something differently. Sometimes I'm really annoyed (or angry) and don't even know what to do. Read the rest of Your Biggest Data Model Complaints