How to create a table from an existing table with new column

Question

Hi !
Please help me.
I want to create a table from an existing table with data and add two new column to the new table.
What will be the syntax?

Answer 1

craete table new_table as select a.*, 'somevalue' new_col1, 'somevalue'
new_col2 from old_table a;Also there is a pitfall - newly created table will accept column type and precision from the select statement, so further you can be needed to modify columns
if you want to have VARCHAR2 instead of CHAR for example:
SQL> create table new_dept as select dept.*, 'New data' new_col from dept;
Table created.
SQL> desc new_dept
Name                                      Null?    Type
DEPTNO                                             NUMBER(2)
DNAME                                              VARCHAR2(14)
LOC                                                VARCHAR2(13)
NEW_COL                                            CHAR(8)
SQL> alter table new_dept modify (new_col varchar2(8));
Table altered.
SQL> desc new_dept
Name                                      Null?    Type
DEPTNO                                             NUMBER(2)
DNAME                                              VARCHAR2(14)
LOC                                                VARCHAR2(13)
NEW_COL                                            VARCHAR2(8)Rgds.
Didn't see michael's post - it reflects the fix for this problem using CAST.
Message was edited by:
dnikiforov