[postgis-users] Append only new features

[brizey02]

I am trying to load the combined
http://www.weather.gov/regsci/gis/shapefiles/allwarn.zip but I only want to
load the new warnings is there a way to load only the new geometries? I was
doing a append but there were warnings being duplicated until they expired,
I know there are 3 unique identifiers WFO, TYPE,ETN is there a way to load
only the new ones?
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