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Find difference between two Text fields

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Can anyone give me a way to find the difference between two text
fields on a character by character basis.  Essentially,  I'd like to
logically AND the two together and for any position that has a
non-zero result show whatever character is in that position for the
second string.  The solution can be postgres specific but something
approaching ANSI SQL would also be helpful (if possible).

-- 
Peter Hunsberger

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