1linesubstring - basic vary M 2:memory: #use in-memory database 3SELECT AsText(Line_Substring(GeomFromText('LINESTRINGM(0 0 0, 10 0 5)'), 0.2, 0.7)) 41 # rows (not including the header row) 51 # columns 6AsText(Line_Substring(GeomFromText('LINESTRINGM(0 0 0, 10 0 5)'), 0.2, 0.7)) 7LINESTRING M(2 0 0, 7 0 0) 8 9