Code:
CREATE TABLE DUAL
(
  DUMMY  VARCHAR2(1)
)
TABLESPACE SYSTEM
PCTUSED    40
PCTFREE    10
INITRANS   1
MAXTRANS   255
STORAGE    (
            INITIAL          16K
            MINEXTENTS       1
            MAXEXTENTS       2147483645
            PCTINCREASE      0
            FREELISTS        1
            FREELIST GROUPS  1
            BUFFER_POOL      DEFAULT
           )
LOGGING 
NOCACHE
NOPARALLEL;


CREATE PUBLIC SYNONYM DUAL FOR DUAL;


GRANT SELECT ON  DUAL TO PUBLIC WITH GRANT OPTION;
HTH