sql - Update statement to move wrong values to correct column -

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i have situation in pl/sql have table called 'gender' has 2 columns gender1 , gender2.
column gender1 supposed have males - value -m , gender2 supposed have female values -f.
ever reason there f values in column gender1 , there m values in column gender2.

is there way in single update statement have values moved respective correct columns?

i think update statement asking:

update gender     set gender1 = (case when gender2 = 'm' 'm' else gender1 end),         gender2 = (case when gender1 = 'f' 'f' else gender2 end)     gender1 = 'f' or gender2 = 'm';

however, don't understand data structure trying represent.


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