remove everything before the period

Hi,
I am trying to remove everything before the period in other words i only
want to show the values that starts from the period. For instance
897.78 ==> 78
74.25 ==> 25
3657.256 ==> 256

well the code below only shows everything before the period but i want to
show everything after the period

select volume, substring(volume from 1 for position('.' in volume) - 1) as
column
from MyTable ;

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