display variable with table columns (select statement) in sql server

Question

Here I want To display Variables Values with Columns of tables

declare @BaseMetal varchar(40)
set @BaseMetal='18K'

 SELECT   CAST(@BaseMetal as varchar(40)) 'BaseMetal', tbl.Columm1,tbl.Columm2, tbl.Columm3 from tbl

O/P should be :

BaseMetal   Columm1   Columm2     Columm3 
  18K       colval1    colval1    colval1
  18K       colval2    colval2    colval2

But when i tried it shows error of Must declare the scalar variable "@BaseMetal".

Answer 1

You don't need the cast.

declare @BaseMetal varchar(40)
set @BaseMetal='18K'

SELECT   @BaseMetal AS 'BaseMetal', tbl.Columm1,tbl.Columm2, tbl.Columm3 from tbl