Query name and segment column length from sys.col table : col « System Tables Data Dictionary « Oracle PL/SQL Tutorial

1. Oracle PL/SQL Tutorial
2. System Tables Data Dictionary
3. col

SQL>
SQL>
SQL> create or replace type address_type as object
  2    ( city    varchar2(30),
  3      street  varchar2(30),
  4      state   varchar2(2),
  5      zip     number
  6    )
  7  /

Type created.

SQL> create or replace type person_type as object
  2    ( name             varchar2(30),
  3      dob              date,
  4      home_address     address_type,
  5      work_address     address_type
  6    )
  7  /

Type created.

SQL> create table people of person_type
  2  /

Table created.

SQL>
SQL> select name, segcollength
  2      from sys.col$
  3     where obj# = ( select object_id
  4                      from user_objects
  5                     where object_name = 'PEOPLE' )
  6  /

NAME                           SEGCOLLENGTH
------------------------------ ------------
SYS_NC_OID$                              16
SYS_NC_ROWINFO$                           1
NAME                                     30
DOB                                       7
HOME_ADDRESS                              1
SYS_NC00006$                             30
SYS_NC00007$                             30
SYS_NC00008$                              2
SYS_NC00009$                             22
WORK_ADDRESS                              1
SYS_NC00011$                             30

NAME                           SEGCOLLENGTH
------------------------------ ------------
SYS_NC00012$                             30
SYS_NC00013$                              2
SYS_NC00014$                             22

14 rows selected.

SQL>
SQL>
SQL> drop table people;

Table dropped.

SQL>
SQL> drop type person_type;

Type dropped.

SQL> drop type address_type;

Type dropped.

SQL>