if isnull(@year,0)=0
    select @currently_year=''
  if @year=2
    select @currently_year=substring(convert(char(4),getdate(),111),3,2)
  if @year=4 
    select @currently_year=substring(convert(char(4),getdate(),111),1,4)
  if isnull(@month,0)=0
    select @currently_month=''以下这句想获取月份:请高手帮助改一下。
  if @month=2
    select @currently_month=substring(convert(char(4),getdate(),111),3,2)