mysql存储过程初级

delimiter//

drop PROCEDURE if EXISTS pr_add;//

create procedure pr_add (a int,b int)

begin

declare c int;

if a i
4000
s null then

set a = 0;

end if;

if b is null then

set b = 0;

end if;

set c = a + b;

select c as sum;

end

call pr_add(10, 20);

    set @a = 10;

    set @b = 20;

    call pr_add(@a, @b);