RE: default constraint updating existing rows
- From: "McNary, Mark" <Mark.McNary@xxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Tue, 16 Dec 2008 13:54:35 -0600
If you don't want the default value in all existing rows, then you need
to update existing rows after adding the column and before adding the
default value.
Thanx,
<-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><->
-Mark McNary
-SENIOR DATABASE ADMINISTRATOR
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<-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><-><->
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Hostetter, Jay M
Sent: Tuesday, December 16, 2008 12:44 PM
To: Harvinder_Singh@xxxxxxxxx; oracle-l@xxxxxxxxxxxxx
Subject: 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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