MySQL 创建存储过程和视图

“pr_add” 是个简单的 MySQL 存储过程，这个MySQL 存储过程有两个 int 类型的输入参数 “a”、“b”，返回这两个参数的和。
1. drop procedure if exists pr_add;
2. 计算两个数之和

create procedure pr_add   
(   
a int,   
b int   
)   
begin   
declare c int;   
if a is 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;   
/*   
return c;  
不能在 MySQL 存储过程中使用。return 只能出现在函数中。
*/   
end;  

mysql> DELIMITER //  
mysql> CREATE PROCEDURE proc1(OUT s int)  
    -> BEGIN 
    -> SELECT COUNT(*) INTO s FROM user;  
    -> END 
    -> //  
mysql> DELIMITER ; 

链接 http://database.51cto.com/art/201006/203159.htm##1

create view stu_class(id,name,glass) as select student.s_id,student.name,stu_idfo.class from student,stu_infowhere student.s_id=stu_info.s_id;

https://blog.youkuaiyun.com/wangxingfan316/article/details/78953649