mysql 写的存储过程,查看返回值为null?

Question

delimiter //

create procedure f(in pid int,out pct int)

begin

delete from test where id=pid;

select count(id) from test into pct;

end//

delimiter ;

call f(4,@name);

select @name;

Answer 1

有人吗,自顶一下,看的视频自学, 不知道为什么我的就是 最后查看结果就是null