deleting data of a given date range.

hey,

I have a huge dataset with over 300000 rows which contains data about
something from 2009-2012. does anyone know how i can delete all the rows
which contain data from 2009 and only have data from 2010-2012???
is there a particular function i can use on the date column so that all data
from 2009 can be deleted???



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