SQL> desc dept
 Name                                      Null?    Type
 ----------------------------------------- -------- -----------------

 DEPTNO                                    NOT NULL NUMBER(2)
 DNAME                                              VARCHAR2(14)
 LOC                                                VARCHAR2(13)

SQL>

Name          Null?    Type           Description 
------------- -------- -------------- --------------------------------------
USER_ID  (PK) NOT NULL NUMBER(15)     Application user identifier 
USER_NAME     NOT NULL VARCHAR2(100)  Application username (what a user types in at the Oracle Applications sign–on screen) 

SQL> create table a1_test
  2  (id    number(3),
  3   ime   varchar2(20));

Table created.

SQL> comment on column a1_test.ime is 'this is a name';

Comment created.

SQL> select c.column_name, c.data_type, c.nullable, m.comments
  2  from user_tab_columns c, user_col_comments m
  3  where c.table_name = 'A1_TEST'
  4    and m.table_name = c.table_name
  5    and m.column_name = c.column_name;

COLUMN_NAME                    DATA_TYPE       N COMMENTS
------------------------------ --------------- - ------------------------------
ID                             NUMBER          Y
IME                            VARCHAR2        Y this is a name

SQL>