Experts,
How can I add new column in middle of the table using ALTER TABLE Temp ADD COLUMN AFTER or BEFORE?
How can I do that in Oracle?
Thanks.
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Hello marvelsoft,
don't know if you can...
the "standard" approach would be to add thecolumn to the table
and then if necessary adjust the view that you normally use to access the table with to give the desired result...
BUT you shoul be using named column lists anyway rather than * in you selects
so that wouldn't be a problem.
Regards,
Lowfatspread
The order of the columns in a table has absolutely NO SIGNIFICANCE whatsoever. In fact, the actual physical arrangement of the data (the physical order of the columns in the physical table, as stored on disk) is entirely out of your control. That is one of the 'beauties' of a relational database. The developer is completely shielded from any knowledge of the physical location of the data, and should never make any design decisions based on any assumption of such physical location. You can always determine the logical order of the fields by explicitly specifying them inan SQL Select statement:
Select Field1, Field2, Field3 from Mytable
will result in the fields in the retrieved data being in the specified order.
AW
Thanks for that experts. I'm just confused before regarding ALTER TABLE command but it is oracle. My point is me as database designer I just wanted to put my columns in order to simply put thing accordingly. I think other solution is before creating your table make sure that is the right columns and data types your going to write.
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Answer for Membership
by: hongjunPosted on 2007-07-07 at 03:59:03ID: 19436968
I think there's no way to do it using a ALTER statement.
You will need to do it indirectly.
rename YOUR_ORIGINAL_TABLE as YOUR_NEW_TABLE;
create table YOUR_ORIGINAL_TABLE nologging /* or unrecoverable */
as
select Column1, Column2, NEW_COLUMN, Column3
from YOUR_NEW_TABLE;
Drop table YOUR_NEW_TABLE;
Select * From YOUR_ORIGINAL_TABLE; <<<<< now you will see the new column in the middle of the table.
But then to change the datatype of the new column, you do something like this
ALTER TABLE YOUR_ORIGINAL_TABLE MODIFY (NEW_COLUMN VARCHAR2(255));