sql - How to update table with data from same table? -

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there table in sql-server:

track(  id uniqueindeficater,  track geography,  the_geom geometry )

now want take track column , put data the_geom column converting geography geometry data type. this:

geometry::stgeomfromtext(track.track.stastext(),4326)

how can update column using data same table?

something this:

update   track set   the_geom = geometry::stgeomfromtext(track.stastext(),4326)

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