Hi. I've got two mediumint columns in a mysql table,
and I'm trying to subtract them like this:

SELECT column1-column2 FROM table WHERE
name='johndoe';

This works some of the time, however, I get weird
results for negative numbers. For example, when
column1=0 and column2=4995, I get:

18446744073709546621

when really the answer should be -4995.

What am I doing wrong?  Thanks!

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