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Generating Alpha numeric values in SQL Server like Identity property


My application has three atributes id, name, sal and a create button.
but the task is the user should not enter id according to his choice..
it should be generated automatically..... when new user is registering...
the no's should be like that a1,a2,a2.... b1,b2,..... no's should be alphanumeric...
s there any solution for this... help me out....
Answer for the above query,
  
 

DECLARE 
@ALPHA_VAL CHAR(1) , @INT_VAL VARCHAR(1000)



DECLARE @VAL INT =97, @VAL1 INT =1

WHILE @VAL <= 122

BEGIN




      SET @VAL1=1

      WHILE @VAL1 < 1000




       BEGIN

                
SET @ALPHA_VAL = CHAR(@VAL)

                
SET @INT_VAL = CONVERT(CHAR,@VAL1) 

               
 SET @INT_VAL= @ALPHA_VAL + @INT_VAL



                PRINT @INT_VAL

                SET @VAL1 =@VAL1+1
        END

SET 
@VAL=@VAL+1

END
The output is 
 

a1

a2

a3

a4

....b1,b2,....b1000...c1,c2.......etc... to z1000

Cheers,

Venkatesan Prabu .J
Head - WWW.Kaashivinfotech.com
http://venkattechnicalblog.blogspot.com/