adding to the current value

[Justin Turner <trnr@xxxxxxxxxxxxxxxxxxxxx>]

I would like to increment  the current value of a field X  without 
having to retrieve field X beforehand. Can I do this?

Example:

UPDATE my_table set field_1 = (current_field_value -1)  WHERE...blah, 
blah, blah....

==============================================
A. Justin Turner

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