Create Column in SQL Server

Question

Hi all,
     I am having below table.
create table Student_Register
Name varchar(30),
FatherName varchar(35),
Address1 varchar(100),
Address2 varchar(100),
Place varchar(75),
Pincode int,
SchoolName varchar(100),
StandardStudy varchar(15)
I am creating after trigger on the above table and inserting into the below table.
create table StudentDetails
Name varchar(30),
FatherName varchar(35),
Address1 varchar(100),
Address2 varchar(100),
Place varchar(75),
Pincode int,
SchoolName varchar(100),
StandardStudy varchar(15)
I need to create one computed column in studentdetails as StudentID with StandardStudy+Replicate(0,3)+lastvalue+1
5th student id
50001
50002
 12th student like
120001
120002
120003
how to implement above logic pls ?
Thanks
Selvaons
Thanks - SelvaKumarSubramaniam.Please MARK AS ANSWER, if my answer is useful to U.

Answer 1

see
http://www.sqlteam.com/article/custom-auto-generated-sequences-with-sql-server
You can make it computed column based on UDF
make UDF as below
CREATE FUNCTION GenerateStudID
@StdStudy varchar(15)
RETURNS int
AS
BEGIN
DECLARE @StudID int
SELECT @StudID = @StdStudy * 10000 + COALESCE((SELECT MAX(StudentID) FROM StudentDetails WHERE StandardStudy =@StdStudy),0) + 1
RETURN (@StudID)
END
then create column as
ALTER TABLE StudentDetails ADD StudentID AS dbo.GenerateStudID(StandardStudy)
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