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time stamp specific to columns




I understand how a timestamp column automatically changes when there is a
change in a data row. Is it possible to limit the update to changes in
particular columns? I have a table where I care about changes in any of
four different columns, but I don¹t care about changes in other columns or
added columns. 

Is there a command that says ³update the time stamp if and only if there
is a change in columns a, b,c, or d"


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