CREATE procedure tong1 @nlsum int output as begin set @nlsum=(select sum(nl) from table22) end

请问@nlsum 作为输出参数~在查询分析器里怎么把@nlsum的值print出来！ 格式我忘记了 ！

execute tong1
declare @nlsum
begin
set @nlsum=(select sum(nl) from table22)
print @nlsum
end
我这样写 老是报错！