SQL Data Types Oracle PLSQL Tutorial

SQL>  create table foo (
  2        a   integer,
  3        b   dec( 9, 2 ),
  4        c   character varying( 30 ),
  5        d   national char( 3 )
  6      )
  7      /
Table created.
SQL> describe foo
 Name                         Null?    Type
 --------------------------- -------- --------------------------------------------------------------------------------------------------------------------
 A                                     NUMBER(38)
 B                                     NUMBER(9,2)
 C                                     VARCHAR2(30)
 D                                     NCHAR(3)
SQL>
SQL> drop table foo;
Table dropped.