SQL Server Identity Column Leading Zeros

Posted on 2010-08-27
Last Modified: 2012-05-10
Can I have my (int) identity column 6 numeric characters?

like this:
Question by:webdork
LVL 142

Accepted Solution

Guy Hengel [angelIII / a3] earned 250 total points
ID: 33546768
a identity field is numerical data type (int ... )numerical data types don't allow leading "0", you need 2 columns ... 1 being int/identity, and the second one being a computed column, using the other column, and formatting it as you need it:
alter table yourtable add formatted_key = right( '000000' + cast(your_identity_key as varchar(10)), 6)

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Author Comment

ID: 33546812
I see... kinda.

I'm guessing if i run the statement above (with correct table and column names) it will create a new column called formatted_key and populate with correct values at this point in tome. How do i keep the new column updated as new records are added?
LVL 30

Expert Comment

ID: 33546818
...or just format the data in your application when you display the value.
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LVL 51

Assisted Solution

HainKurt earned 250 total points
ID: 33546823
leave it as identity (int) and use sql to get it formatted

select id, right('000000'+cast(id as varchar),6) as fid from myTable
LVL 58

Expert Comment

ID: 33546904
> it will create a new column called formatted_key

> and populate with correct values at this point in tome.
no- a COMPUTED column is a "virtual" column that is only calculated when used. nothing is stored *

> How do i keep the new column updated as new records are added?
a COMPUTED column is "virtual", and only calculated when used, so whenever you use

select identity_key, formatted_key ....

formatted_key will automatically expand to "right( '000000' + cast(your_identity_key as varchar(10)), 6)" and give you the result desired.

* You can make a computed column stored by creating an index on it.

Author Comment

ID: 33546997

Thank you so much for your detailed valuable response. I'd assigned points before I saw your input.

LVL 58

Expert Comment

ID: 33547597

It is no problem.  Just wanted to make sure you understood.


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