第五次作业，触发器建表

mysql> create table goods(gid char(8) primary key, name varchar(10),price decimal(8,2),num int);

2.mysql> create table orders(oid int primary key auto_increment,gid char(10) not null,name varchar(10),price decimal(8,2),onum int, otime date);

 

 

 

 

建立触发器，客户取消订单，恢复商品表对应商品数量

mysql> create trigger orders_after_delete_trigger after delete on orders for each row update goods set num=num+old.onum where gid=old.gid;

测试：delete from orders where oid=2;

 

 

 

建立存储器：

1.创建提取emp_new表所有员工姓名和工资的存储过程S1

mysql> delimiter //
mysql> create procedure s1()
    -> begin
    ->  select name,incoming from emp_new;
    -> end //

mysql> delimiter ;
mysql> call s1();