Basic MySQL. XOR?

[Dwight E Chadbourne]

I'm not trying to do anything difficult.  Two people are handing me CSV 
files and I don't care about what they agree on.  This morning I was 
thumbing through "Mathematics: From the Birth of Numbers"  by Pär Gullberg 
and saw a clear way to say what I want, symmetric difference.  Sorry if 
that is used in other ways I'm not familiar with.  I'm sure people do this 
all the time.  My first few efforts didn't give what I know should be the 
answer and google doesn't seem to like my choice of words.  Thought I'd 
poke around the forum.  - Eric.

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