13DDistance - two 2D identical points 2:memory: #use in-memory database 3SELECT ST_3DDistance(MakePoint(1, 2), MakePoint(1, 2)) 41 # rows (not including the header row) 51 # columns 6ST_3DDistance(MakePoint(1, 2), MakePoint(1, 2)) 70.0 8 9