SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

create function [dbo].[F_price](@Contractno varchar(50))   
    returns nvarchar(100)   
    as   
       begin      
          declare  @S nvarchar(100)      
          select @S=isnull(@S,'')+convert(varchar,price)+' ' from import_cargo where Contractno=@Contractno      
          return @S   
      end   
GO

select dbo.f_price('XXH201311180014')