How to insert into table, of table description of table

Dear All,
I need to take the table description of the table and i need to insert that description in to a new table column , please help me to how to write the query for these.
many thanks in advance
Sreenivasulu P

user627163 wrote:
Dear All,
I need to take the table description of the table and i need to insert that description in to a new table column , please help me to how to write the >query for these.Why insert into a new column into the same table ? That would be madness. :) (kidding)
You can explore with this :
[oracle@g5 ~]$ sqlplus scott/tiger
SQL*Plus: Release 11.1.0.6.0 - Production on Tue Jun 2 09:23:10 2009
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> create table dtable (tablename varchar2(20),col_name varchar2(20),Not_null varchar2(1), datatype varchar2(20) );
Table created.
SQL> desc dtable
Name                                      Null?    Type
TABLENAME                                          VARCHAR2(20)
COL_NAME                                           VARCHAR2(20)
NOT_NULL                                           VARCHAR2(1)
DATATYPE                                           VARCHAR2(20)
SQL> set wrap off
SQL> SELECT column_name "Name", nullable "Null?",
       CONCAT (CONCAT (CONCAT (data_type, '('), data_length), ')') "Type"
FROM user_tab_columns
WHERE table_name = 'EMP';
Name                           N Type
EMPNO                          N NUMBER(22)
ENAME                          Y VARCHAR2(10)
JOB                            Y VARCHAR2(9)
MGR                            Y NUMBER(22)
HIREDATE                       Y DATE(7)
SAL                            Y NUMBER(22)
COMM                           Y NUMBER(22)
DEPTNO                         Y NUMBER(22)
8 rows selected.
SQL> INSERT INTO dtable
   SELECT 'emp', column_name, nullable,
          CONCAT (CONCAT (CONCAT (data_type, '('), data_length), ')') "Type"
     FROM user_tab_columns
    WHERE table_name = 'EMP';
8 rows created.
SQL> commit;
Commit complete.
SQL> select * from dtable;
TABLENAME            COL_NAME             N DATATYPE
emp                  EMPNO                N NUMBER(22)
emp                  ENAME                Y VARCHAR2(10)
emp                  JOB                  Y VARCHAR2(9)
emp                  MGR                  Y NUMBER(22)
emp                  HIREDATE             Y DATE(7)
emp                  SAL                  Y NUMBER(22)
emp                  COMM                 Y NUMBER(22)
emp                  DEPTNO               Y NUMBER(22)
8 rows selected.
many thanks in advancecheers
Sreenivasulu P

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