Making an IDENTITY column

Hi,
I have a field in my sql table called ORDER_NO which is also the primary
key. Now, I want to add amother field called AO_Number whose valued incremen
t
whenever a record is added . Those values should be AO-1, AO-2, AO-3...& so
on...
How to have these values for this field coz making it an identity column
makes the Values 1,2 ,3 ... & not AO-1,AO-2,AO-3...
Is this possible? & how?
--
pmudYou could have an identity column AND a calculated column that combined the
identity with the value you wanted.
"pmud" <pmud@.discussions.microsoft.com> wrote in message
news:FAA53637-F523-4ABF-977F-6CF66695B6F3@.microsoft.com...
> Hi,
> I have a field in my sql table called ORDER_NO which is also the primary
> key. Now, I want to add amother field called AO_Number whose valued
increment
> whenever a record is added . Those values should be AO-1, AO-2, AO-3...&
so
> on...
> How to have these values for this field coz making it an identity column
> makes the Values 1,2 ,3 ... & not AO-1,AO-2,AO-3...
> Is this possible? & how?
> --
> pmud|||Hi Mike,
Where do I have to write the sql code for creating a calculated column? In
user defined functions?
Thanks
"Mike Jansen" wrote:

> You could have an identity column AND a calculated column that combined th
e
> identity with the value you wanted.
> "pmud" <pmud@.discussions.microsoft.com> wrote in message
> news:FAA53637-F523-4ABF-977F-6CF66695B6F3@.microsoft.com...
> increment
> so
>
>|||Here is how to do it. You can also create a view.
alter your_table
add ao_number int not null identity(1, 1)
go
alter your_table
all ao_formatted_number as 'AO-' + ltrim(ao_number)
go
selet * from your_table
go
AMB
"pmud" wrote:
[vbcol=seagreen]
> Hi Mike,
> Where do I have to write the sql code for creating a calculated column? I
n
> user defined functions?
> Thanks
> "Mike Jansen" wrote:
>|||Here is an example:
CREATE TABLE tbl (
key_col INT NOT NULL PRIMARY KEY,
id_col INT NOT NULL IDENTITY,
calc_col AS 'AO-' + CAST( id_col AS VARCHAR ), -- calculated column
..)
If you are looking for a truly monotonic sequence, avoid identity. There are
certain instances where identity column can have gaps its values. If the
value is something that can be derived based on some collating sequence of
existing values in other columns, consider using a ranking mechanism like
the one detailed in KBA 186133. Another alternative, is to use a view which
can generate the sequential values based on existing columns without
exposing its complexity.
Anith|||Hi Aljandro,
That solved my problem.
Thanks
"Alejandro Mesa" wrote:
[vbcol=seagreen]
> Here is how to do it. You can also create a view.
> alter your_table
> add ao_number int not null identity(1, 1)
> go
> alter your_table
> all ao_formatted_number as 'AO-' + ltrim(ao_number)
> go
> selet * from your_table
> go
>
> AMB
> "pmud" wrote:
>