1.建立学生信息表

-- 触发器
-- 建立学生信息表
create table s1(
                   id int unsigned auto_increment,
                   name varchar(30),
                   score tinyint unsigned,
                   dept varchar(50),
                   primary key(id)
);

2.建立学生补考信息表

-- 建立学生补考信息表
create table s2 like s1;

3.建立触发器（一共建立了三个触发器）

-- 建立触发器
-- 插入触发器
delimiter //
create trigger t1 after insert on s1 for each row
begin
    if NEW.score<60 then
        insert into s2 values(new.id,new.name,new.score,new.dept);
    end if;
end//
delimiter ;
-- 删除触发器
delimiter //
create trigger t2 after delete on s1 for each row
begin
    delete from s2 where old.id = id;
end//
delimiter ;
-- 更新触发器
delimiter //
create trigger t3 after update on s1 for each row
begin
    if new.score < 60 then
        replace into s2 value(new.id,new.name,new.score,new.dept);
    else
        delete from s2 where id = new.id;
    end if;
end//
delimiter ;

4.插入数据

-- 插入数据
insert into s1 value(null,'李四',60,'计算机科学');
insert into s1 value(null,'赵六',30,'会计');
insert into s1 value(null,'李四玉',70,'计算机科学');
insert into s1 value(null,'周五',80,'英语');
insert into s1 value(null,'赵强',10,'计算机科学');
insert into s1 value(null,'王七',98,'英语');

5.查询结果

select * from s2;
select * from s1;

 查询s1表

 查询s2表