1BdMPolyFromWKB - zeroblob(58), SRID 2:memory: #use in-memory database 3SELECT BdMPolyFromWKB(zeroblob(58), 4); 41 # rows (not including the header row) 51 # columns 6BdMPolyFromWKB(zeroblob(58), 4) 7(NULL) 8 9 10