Conversion Functions Oracle PLSQL

SQL>
SQL> CREATE TABLE myCar
  2  (
  3    MAKER  VARCHAR (25),
  4    MODEL  VARCHAR (25),
  5    PRICE  NUMERIC
  6  );
Table created.
SQL>
SQL> INSERT INTO myCar VALUES('CHRYSLER','CROSSFIRE',33620);
1 row created.
SQL> INSERT INTO myCar VALUES('CHRYSLER','300M',29185);
1 row created.
SQL> INSERT INTO myCar VALUES('HONDA','CIVIC',15610);
1 row created.
SQL> INSERT INTO myCar VALUES('HONDA','ACCORD',19300);
1 row created.
SQL>
SQL> INSERT INTO myCar VALUES('FORD','MUSTANG',15610);
1 row created.
SQL> INSERT INTO myCar VALUES('FORD','LATESTnGREATEST',NULL);
1 row created.
SQL> INSERT INTO myCar VALUES('FORD','FOCUS',13005);
1 row created.
SQL>
SQL> SELECT * FROM  myCar;
MAKER                     MODEL                          PRICE
------------------------- ------------------------- ----------
CHRYSLER                  CROSSFIRE                      33620
CHRYSLER                  300M                           29185
HONDA                     CIVIC                          15610
HONDA                     ACCORD                         19300
FORD                      MUSTANG                        15610
FORD                      LATESTnGREATEST
FORD                      FOCUS                          13005
7 rows selected.
SQL>
SQL> SELECT
  2     model,
  3     DECODE(maker, 'CHRYSLER','DOMESTIC'
  4           ,'FORD','DOMESTIC'
  5           ,'FOREIGN')
  6  FROM myCar;
MODEL                     DECODE(M
------------------------- --------
CROSSFIRE                 DOMESTIC
300M                      DOMESTIC
CIVIC                     FOREIGN
ACCORD                    FOREIGN
MUSTANG                   DOMESTIC
LATESTnGREATEST           DOMESTIC
FOCUS                     DOMESTIC
7 rows selected.
SQL>
SQL>
SQL> drop table myCar;
Table dropped.