Aha, the design wizard. That sucks big donkey balls if you excuse my expression, and not just when using with Oracle in my opinion. Use Oracle SQL Developer[^] for creating your queries instead, or SQLTools[^] if you want something lightweight and high performance. I personally also prefer DataReaders instead of TableAdapters, but the comparison and reasoning is to much for a forum post on my behalf, read Piebalds post[^] for some reasoning, otherwise I'd recommend Google.
Be excellent to each other. And... PARTY ON, DUDES! Abraham Lincoln