create auto number

Hi ,
I need to create auto number for customer number,according same with auto number filed
 see below code
Prefix='Cus'
CREATE TABLE dbo.Customers
(
Sequence   int  IDENTITY(1,1) NOT NULL
, Prefix     nchar(1) NOT NULL
, CustomerID AS Prefix + CAST(Sequence + 1000000 as nvarchar(8))
, CONSTRAINT UN_CustomersSequence UNIQUE (Sequence)
, CONSTRAINT PK_Customers PRIMARY KEY (CustomerID)

This is right way or any other proper way?
LVL 2
lankapalaAsked:
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arnoldCommented:
Customerid should be auto_increment, you can preset the starting point if you want.
You can create a unique index for prefix+customer id but that will be redundant as customerID will be unique.
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Vitor MontalvãoMSSQL Senior EngineerCommented:
Why do you need to store de CustomerID? If you have Sequence and Prefix, every time you need the customer id you can perform the concatenation so you won't waste space in disk.
Anyway, how you're doing is correct. It's called Computed Column.
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ukerandiCommented:
But im getting following error
Only UNIQUE or PRIMARY KEY constraints can be created on computed columns, while CHECK, FOREIGN KEY, and NOT NULL constraints require that computed columns be persisted.
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lankapalaAuthor Commented:
??update?
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Vitor MontalvãoMSSQL Senior EngineerCommented:
What do you mean with "??update?"
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