RE: default constraint updating existing rows

Try splitting the "alter table" into two different statements.

Alter table test add (b int);

Alter table test modify (b int default 3);

Jay

-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Harvinder Singh
Sent: Tuesday, December 16, 2008 1:22 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: default constraint updating existing rows

Hi,

We are adding a column with default constraint and we only want it to
apply to new rows but it is updating existing rows even though column
allows null. I am using the following test:

SQL> create table test (a int);

Table created.

SQL> insert into test values(1);

1 row created.

SQL> insert into test values(2);

1 row created.

SQL> alter table test add b int default 3;

Table altered.

SQL> select * from test;

         A          B
---------- ----------
         1          3
         2          3

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

 A                                                  NUMBER(38)
 B                                                  NUMBER(38)


Is there any way to add new column with default constraint without
updating existing rows?

Thanks
--Harvinder








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