AutoGenerate an AlphaNumeric Sequence in SQL Server

I was recently solving a requirement of a client where the client needed a Unique Alphanumeric Sequence Number to be generated using the following business rules:

UniqueID = Code (TT) + Current Datetime + ID

Here's how I generated the UniqueID

DECLARE @TT TABLE

(

ID  int, CircuitName varchar(10),

UniqueID  AS 'TT' + REPLACE(CONVERT(varchar, GETDATE(),101),'/','')

+ REPLACE(CONVERT(varchar, GETDATE(),108),':','') 

+ CAST(ID as varchar(10))

)

 

INSERT @TT

SELECT 1, 'Circuit 1' UNION ALL

SELECT 2, 'Circuit 2' UNION ALL

SELECT 3, 'Circuit 3' UNION ALL

SELECT 4, 'Circuit 4' UNION ALL

SELECT 5, 'Circuit 5' UNION ALL

SELECT 6, 'Circuit 6' UNION ALL

SELECT 7, 'Circuit 7' UNION ALL

SELECT 8, 'Circuit 8' UNION ALL

SELECT 9, 'Circuit 9' UNION ALL

SELECT 10, 'Circuit 10'

 

SELECT * FROM @TT

OUTPUT

ID    CircuitName    UniqueID

1    Circuit 1    TT051220091517481

2    Circuit 2    TT051220091517482

3    Circuit 3    TT051220091517483

4    Circuit 4    TT051220091517484

5    Circuit 5    TT051220091517485

6    Circuit 6    TT051220091517486

7    Circuit 7    TT051220091517487

8    Circuit 8    TT051220091517488

9    Circuit 9    TT051220091517489

10    Circuit 10    TT0512200915174810