Question

编写一个触发器，让新学生像其他人一样自动命名为“友好”。也就是说，在触发器运行之后，我们应该在Likes表中为每个其他与“友好”相同等级的高中学生A拥有（'友好'，A）。

create trigger R1
    before insert on Highschooler
    for each row
    when  New.name="Friendly"
    begin
      insert into Likes 
     Select New.ID,ID from Highschooler where grade = New.grade ;
     end;

Answer 1

Oracle触发器代码

create trigger R1
    before insert on Highschooler
    for each row
    when  New.name="Friendly"
    begin
      insert into Likes 
     Select New.ID,ID from Highschooler where grade = New.grade ;
     end;

此MySQL触发器代码的行为应与Oracle触发器代码相同。

delimiter $$;
create trigger R1
    before insert on Highschooler
    for each row
    begin
      if NEW.name = "Friendly" then
       insert into Likes Select New.ID,ID from Highschooler where grade = New.grade ;
      end if;
     end$$
delimiter;

oracle触发到MySql

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