The following sequence of commands will create the table test_table with OID 420, having two columns cola and colb of type int4 and text, respectively, and insert two rows into the table:
create test_table 420 (cola = int4, colb = text) open test_table insert OID=421 ( 1 "value1" ) insert OID=422 ( 2 _null_ ) close test_table